Answerbag: Farino's answers

Answer to Can you think of a case where precision would be more important than accuracy? How about a case where accuracy would be more important than precision?

Mon, 16 Mar 2009 14:07:49 -0700

Can you think of a case where precision would be more important than accuracy? How about a case where accuracy would be more important than precision?

A painting. An impressionist will use precise strokes of the brush to impress a feeling but accuracy of what they're painting will worsen the painting. Quantum mechanics. If you want to measure the magnitude of a subatomic particle then accuracy will measure it accurately but the...

Answer to What is the process involving hydrostatic pressure by which water is forced from the blood to the tissue

Mon, 16 Mar 2009 14:00:19 -0700

What is the process involving hydrostatic pressure by which water is forced from the blood to the tissue

Osmosis

Answer to What is the balanced chemical equation for the hydrogen test?

Mon, 02 Mar 2009 16:58:47 -0800

What is the balanced chemical equation for the hydrogen test?

2*H2 + O2 => 2*H2O

Answer to If your boyfriend has sex with you without a condom and doesn't try to cum in you when he is close pulls out what are really the chances of getting pregnant from discharge?

Mon, 02 Mar 2009 16:56:40 -0800

If your boyfriend has sex with you without a condom and doesn't try to cum in you when he is close pulls out what are really the chances of getting pregnant from discharge?

I do not know the precise chances but there is a fluid called 'precum' that lines the penis so that the semen can pass through more easily. Although this does not contain any semen it may wash through some sperm that were already in there from the most previous ejaculation. This is felt...

Answer to Would a paraplegic get angry if you cut his legs off?

Mon, 02 Mar 2009 16:51:40 -0800

Would a paraplegic get angry if you cut his legs off?

Yes. Whether there is use/feelings in their legs or not is irrelevant. Their legs are a part of who they are, remove their legs and you remove a part of them emotionally. Not to mention that science may find a medicine that will cure their disability.

Answer to What are the names of the different part of a decimal number (0.4)?

Mon, 23 Feb 2009 03:55:25 -0800

What are the names of the different part of a decimal number (0.4)?

0.4, 0 is the integer & 4 is the decimal.

Answer to Why is this statement wrong? "A rock is thrown straight into the air. At the peak its acceleration is zero." To me, at the peak it is neither speeding up, slowing down or turning, it's just hanging there. Therefore, zero acceleration...right?

Mon, 23 Feb 2009 03:51:57 -0800

Why is this statement wrong? "A rock is thrown straight into the air. At the peak its acceleration is zero." To me, at the peak it is neither speeding up, slowing down or turning, it's just hanging there. Therefore, zero acceleration...right?

On the way up the rock is decelerating (-g) and on the way down the rock is accelerating (+g). In order for the acceleration to go from a negative to a positive it MUST pass through zero. Once it decelerates to a zero velocity it is no longer moving and thus has zero acceleration.

Answer to (x by y)what is the formula to find the distance from 0x0 to a point? and 2nd question if i know the distance from me to a object as N and how tall it is as M what would the formula be for figuring out the angle from me to the top of said object? thanks

Mon, 26 Jan 2009 05:13:28 -0800

(x by y)what is the formula to find the distance from 0x0 to a point? and 2nd question if i know the distance from me to a object as N and how tall it is as M what would the formula be for figuring out the angle from me to the top of said object? thanks

The graph demonstrates that the distance from (0,0) to (x,y) is = sqrt(x^2 + y^2) The diagram of a tree demontrates that the angle from the ground is = arctan(M/N). For the angle from your eyes/height, merely minus that from M.

Answer to A cone is circumscribed about a sphere with fixed radius a. If r is the radius of the base of the cone, express its volume as a function of r?

Mon, 26 Jan 2009 05:04:46 -0800

A cone is circumscribed about a sphere with fixed radius a. If r is the radius of the base of the cone, express its volume as a function of r?

If 'a' is a fixed distance then the cone has infinite possible sizes: Volume=(h*pi*r^2)/3, s.t. r>a & h>2a

Answer to If the line Y=m x+b is tangent to the circle x^2 +y^2=r^2. What is the equation of that circle relating to m, b, and r?

Mon, 26 Jan 2009 04:55:52 -0800

If the line Y=m x+b is tangent to the circle x^2 +y^2=r^2. What is the equation of that circle relating to m, b, and r?

You have infinite possibilities. You need to give some of the variables values.

Answer to Can someone with A+ blood donate a part of her liver to someone that has O+ blood?

Mon, 26 Jan 2009 04:47:45 -0800

Can someone with A+ blood donate a part of her liver to someone that has O+ blood?

Those with O+ can only receive blood/organs from O- & O+.

Answer to What is the difference between an indefinite and definite integral?

Sat, 24 Jan 2009 03:03:18 -0800

What is the difference between an indefinite and definite integral?

An indefinite integral is the integral of a function without upper and lower boundaries. A definite integral is the integral of a function with such boundaries and as such has an actual numerical answer.

Answer to Differentiate: F(x)=(16x)^3?

Sat, 24 Jan 2009 02:59:07 -0800

Differentiate: F(x)=(16x)^3?

F(x)=(16x)^3 F(x)=4096x^3 F'(x)=12288x^2

Answer to What is the difference stroma and stomata

Fri, 23 Jan 2009 07:48:15 -0800

What is the difference stroma and stomata

If you meant 'stoma' instead of 'stroma' then stoma is singular and stomata is plural of pores on the under side of a leaf. Stroma refers to connective tissue, connective fluids and connective cells. So quite a lot of difference between connectiveness and pores.

Answer to A hound was chasing a fox. whenever the hound took 4 leaps, the fox took 5. If 3 hound leaps cover the same distance as 4 fox leaps, the fox's head start was equal to 90 hound leaps, how many leaps did the hound need to catch the fox

Thu, 08 Jan 2009 16:57:03 -0800

A hound was chasing a fox. whenever the hound took 4 leaps, the fox took 5. If 3 hound leaps cover the same distance as 4 fox leaps, the fox's head start was equal to 90 hound leaps, how many leaps did the hound need to catch the fox

Let's say that a hound's leap is 4", therefore a fox's leap will be 3". Every time that the hound takes 4 leaps the fox will take an extra leap. So after 4 hound leaps its distance covered will be 16" and the fox will cover 4*3+3=15" I did it on Excel and...

Answer to The slope of the line represented by the equation y = 4 is undefined? is it always or sometimes. (can u give me hints)

Thu, 08 Jan 2009 16:22:09 -0800

The slope of the line represented by the equation y = 4 is undefined? is it always or sometimes. (can u give me hints)

Slope is calculated by (y2-y1)/(x2-x1). Seeing as every point on this line gives (4-4)/(x2-x1) = 0/(x2-x1) = 0, i.e. horizontal. This means that for any y = a the gradient is 0, not undefined. The only way you could get a slope as undefined is if it is vertical: x = 4. (y2-y1)/(x2-x1) =...

Answer to What is the total surface area of a square pyramid with a base length of 8yd and a hight of 13yd?

Thu, 08 Jan 2009 16:17:40 -0800

What is the total surface area of a square pyramid with a base length of 8yd and a hight of 13yd?

Height = 13, distance from centre of the base to the centre of one of the sides of the base = 4. Length of each sloping face from base to tip = rt(4^2 + 13^2) = 13.60147051... Area of of each sloping face = .5*8*13.60147051... = 54.40588203... Four sloping faces, => 4*54.40588203... =...

Answer to How many gallons is my fish tank? it is 72 inches long 15 inches deep and 17 inches tall

Thu, 01 Jan 2009 17:54:34 -0800

How many gallons is my fish tank? it is 72 inches long 15 inches deep and 17 inches tall

72*15*17 = 18360"^3 UK fluid ounce ≈ 1.733871455"^3 18360/1.733871455 = 10589.02028 UK fl oz. Gallon is 160 UK fl oz. 10589.02028/160 = 66.18137675 UK gallons. US fluid ounce = 1.8046875"^3 18360/1.8046875 = 10173.50649 US fl oz. Gallon is 128 US fl oz....

Answer to Triangle ABC.
Thu, 01 Jan 2009 17:42:36 -0800
Triangle ABC.
Sine Rule: a/sinA = b/sinB = c/sinC c = 1, sinC = 0.939692621... 1/0.939692621... = 1.064177772... a/sinA = 1.064177772... a = sinA1.064177772... = 0.766044443...1.064177772... = 0.815207469... b/sinB = 1.064177772... b = sinB1.064177772... = 0.866025404...1.064177772... =...

Answer to Graph each line and find the area of the enclosed triangle y=x-2, x=3, y=-6 A) area =12 B) area =25 C) area = 24.50 D) area=48

Thu, 01 Jan 2009 17:12:20 -0800

Graph each line and find the area of the enclosed triangle y=x-2, x=3, y=-6 A) area =12 B) area =25 C) area = 24.50 D) area=48

y=x-2 When x is 3, y is 1. Height of triangle is 1--6=7 When y is -6, x is -4. Width of triangle 3--4=7 Base*height/2=7*7/2 =49/2 =24.5 units^2

Answer to Would a bullet fired from a gun travel faster in the vacuum of space than it would on Earth?

Fri, 26 Dec 2008 17:59:34 -0800

Would a bullet fired from a gun travel faster in the vacuum of space than it would on Earth?

Assuming that the gun is kept stationary then yes. Less friction (drag), less decelleration and a greater speed. If the gun is not kept stationary then the bullet's speed will be less. This is because the explosive force is not focused upon the bullet but everything around the bullet (the...

Answer to If exposure to a creature's surroundings is what is responsible for that creature to evolve, do subtle differences based on a humans region and/or behavior have an evolutionary effect on human? (exposure to day or night, hot or cold, etc...)

Wed, 24 Dec 2008 18:15:15 -0800

If exposure to a creature's surroundings is what is responsible for that creature to evolve, do subtle differences based on a humans region and/or behavior have an evolutionary effect on human? (exposure to day or night, hot or cold, etc...)

It is our physical features that distinguish races that prove that we are still evolving due to the subtle differences in our environments. Black people are darker skinned because of a higher concentration of melanin to defend against the UV radiation, which is how we started out. Skandinavians...

Answer to If the sequence goes a million then a billion, what are the next numbers and how many zeros does each one have?

Mon, 22 Dec 2008 06:50:52 -0800

If the sequence goes a million then a billion, what are the next numbers and how many zeros does each one have?

The definition of a million is 10^6 (1 with 6 zeros following it) from Latin: 'mille' = thousand & '-one' = greater version of. To get the word billion the word million is dissected incorrectly but that is how we have the word. The first two letters of million have been...

Answer to Find the slope and midpoint of the segment with endpoints (1, -4) and (-3, 2).

Mon, 22 Dec 2008 06:31:08 -0800

Find the slope and midpoint of the segment with endpoints (1, -4) and (-3, 2).

y = mx + c m = (y2-y1)/(x2-x1) = (2--4)/(-3-1) = 6/-4 = -3/2 => your slope Midpoint: midway between the y coordinates will be (2+-4)/2 = -2/2 = -1 Midway between the x coordinates will be (-3+1)/2 = -2/2 = -1 Midpoint = (-1,-1)

Answer to When were bombs invented? How effective were the early ones?

Mon, 22 Dec 2008 06:17:54 -0800

When were bombs invented? How effective were the early ones?

"The first grenades appeared in the Byzantine Empire, not long after the reign of Leo III (717-741).[2] Byzantine soldiers learnt that Greek fire, a Byzantine invention of the previous century, could not only be thrown by flamethrowers at the enemy, but also in stone and ceramic jars."...

Answer to What does it mean if someone says it looks like you've had a lobotomy?

Sun, 21 Dec 2008 12:52:29 -0800

What does it mean if someone says it looks like you've had a lobotomy?

A lobotomy is when parts of the prefrontal cortex (the part of the brain that deals with complex behaviour patters) have been cut away, leaving a person reminiscant of being VERY drunk.

Answer to Cuboid AxAxB has two ellipses touching the edges of the faces and one circle, also touching the edges of the faces, drilled out. What is the volume left? (image in first answer)

Tue, 16 Dec 2008 16:12:58 -0800

Cuboid AxAxB has two ellipses touching the edges of the faces and one circle, also touching the edges of the faces, drilled out. What is the volume left? (image in first answer)

My answer: ba^2(1-(pi(4-rt2)+32)/48)

Answer to Which of the following statements is true for f(x)=x^(1/3)+1? I f(x) is always increasing, x doesn't equal 0. II The tangent to the curve at x=0 is horizontal III The Mean Value Theorem can be applied to f(x) in the closed interval -1<=x<=1 Explain

Sat, 13 Dec 2008 11:06:51 -0800

Which of the following statements is true for f(x)=x^(1/3)+1? I f(x) is always increasing, x doesn't equal 0. II The tangent to the curve at x=0 is horizontal III The Mean Value Theorem can be applied to f(x) in the closed interval -1<=x<=1 Explain

I) Not true. 0 is still part of the curve and it is increasing. Therefore, not true. II) Looking at the graph, when x<0 the curve is becoming more and more vertical and when x>0 the curve is becoming more and more horizontal. Therfore the 'tangent' is vertical. dy =...

Answer to What unique structures were created by the axum people as part of their religion?

Sat, 13 Dec 2008 10:05:10 -0800

What unique structures were created by the axum people as part of their religion?

"The kingdom of Aksum had its own written language called Ge'ez, and also developed a distinctive architecture exemplified by giant obelisks, the oldest of which (though much smaller) date from 5,000-2,000 BC" ...

Answer to What unique structures were created by the axum people as part of their religion?

Sat, 13 Dec 2008 10:04:35 -0800

Answer to How to find the valve of k in (2,3)(-3,-7)(k,9) if they are colinear?

Tue, 25 Nov 2008 04:03:18 -0800

How to find the valve of k in (2,3)(-3,-7)(k,9) if they are colinear?

y=mx+c m=(y2-y1)/(x2-x1) =(-7-3)/(-3-2) =-10/-5 =2 y=2x+c x=2, y=3 3=2*2+c 3=4+c c=-1 y=2x-1 y=>9 9=2x-1 10=2x x=5=k

Answer to Find dy/dx: y=1/2sin2x

Tue, 25 Nov 2008 03:58:27 -0800

Find dy/dx: y=1/2sin2x

y=sin(2x)/2 y'=(sin(2x))'(2x)'/2 =cos(2x)*2/2 =cos(2x)

Answer to THE CRUDE BIRTH RATE OF A POPULATION IS 43 BIRTHS PER 1000 PEOPLE, AND THE CRUDE DEATH RATE IS 18 DEATHS PER 1000 PEOPLE.CALCULATE THE ANNUAL PERCENT GROWTH OF THE POPULATION.

Tue, 25 Nov 2008 03:56:19 -0800

THE CRUDE BIRTH RATE OF A POPULATION IS 43 BIRTHS PER 1000 PEOPLE, AND THE CRUDE DEATH RATE IS 18 DEATHS PER 1000 PEOPLE.CALCULATE THE ANNUAL PERCENT GROWTH OF THE POPULATION.

43-18=25 100*25/1000=2.5%

Answer to How many degrees are there in each exteior angle of an equilateral triangle?

Sun, 23 Nov 2008 06:17:09 -0800

How many degrees are there in each exteior angle of an equilateral triangle?

n = number of sides of a regular polygon. Angle of exterior angles = 360/n Angle of interior angles = 180 - 360/n I've just read my answer again, did you mean the obtuse angles on the outside? If so then add 180 to my equation for the exterior angles.

Answer to In thermosyphoning does the cold water fall because its heavier or is it the reverse

Sun, 23 Nov 2008 06:10:23 -0800

In thermosyphoning does the cold water fall because its heavier or is it the reverse

Temperature isn't affected by density. The 'hot' molecules vibrate more and thus take up more space around them making the object expand with the same mass, hence it becomes lighter. The 'cool' molecules are vibrating less and thus take up less space around them making...

Answer to How do you find the dimensions of matrixes?

Thu, 20 Nov 2008 18:41:25 -0800

How do you find the dimensions of matrixes?

The dimensions of matrices are the amount of rows (m) & the amount of columns (n). So the matrix: 1 2 3 4 5 6 has dimensions 2x3.

Answer to Can someone help me with an experiment idea (simple at home) that illustrates a chemical change and/or reaction?

Thu, 20 Nov 2008 18:37:24 -0800

Can someone help me with an experiment idea (simple at home) that illustrates a chemical change and/or reaction?

Drip lemon juice on baking soda. You'll have an acid dripping onto an alkali creating a fizz and an increase in temperature.

Answer to Shouldn't a combination lock be called a permutation (when order matters)? Or is it just me?

Tue, 18 Nov 2008 18:08:58 -0800

Shouldn't a combination lock be called a permutation (when order matters)? Or is it just me?

There are few things that have their mathematical reference because the mathematical reference is rather dark because mathematics reveals dark conclusions about nature (view http://www.iop.org/News/news_25221.html).

Answer to When watching the history channel there was an interesting topic about USO's. Never heard of them. What do you think about USO's?

Sun, 16 Nov 2008 17:13:27 -0800

When watching the history channel there was an interesting topic about USO's. Never heard of them. What do you think about USO's?

There are about 100,000,000,000,000,000,000 stars in the known universe. Pretty much all of them will have planets orbiting them and some of those will have moons. The chances that we are the only intelligent lifeforms (of this form) in this universe is negligible. Perhaps some of those life...

Answer to I have 10 glasses in a row, 5 with water, 5 empty-, what would be the minimum number of glasses needed to move so that the water and empty glasses alternate?

Sun, 16 Nov 2008 17:03:55 -0800

I have 10 glasses in a row, 5 with water, 5 empty-, what would be the minimum number of glasses needed to move so that the water and empty glasses alternate?

2. Pour the contents of the second into the 7th & pour the contents of the 4th into the 9th.

Answer to How do you find the inverse function? 2X+1 all over X. and/or 5 all over the square root of X.

Tue, 11 Nov 2008 05:03:14 -0800

How do you find the inverse function? 2X+1 all over X. and/or 5 all over the square root of X.

You replace the x for the f(x) (inverse of f(x) will be represented as f(x)'): f(x) = (2x+1)x^-1 = 2 + x^-1 x = 2 + f(x)'^-1 f(x)'^-1 = x - 2 f(x)' = (x - 2)^-1 f(X) = 5X^-.5 X = 5f(X)'^-.5 f(X)'^-.5 = X/5 f(X)'^.5 = 5/X f(X)' = (5/X)^2

Answer to A triangle ABC has vertices at A(4,1) and B(9,6). The vertex C lies along the line y=(1/2)x-1. If the length of BC is 5, prove mathematically that there are two possible points for vertex C and find their co-ordinates?

Sat, 08 Nov 2008 04:16:33 -0800

A triangle ABC has vertices at A(4,1) and B(9,6). The vertex C lies along the line y=(1/2)x-1. If the length of BC is 5, prove mathematically that there are two possible points for vertex C and find their co-ordinates?

In green you have the coordinates A & B. In blue you have y = x/2 - 1. In magenta you have a cirle with radius 5 and centred at B. Granted, the circle is not accurate but it indicates that the two points possible along y that will give a triangle with the distance between B & C as 5...

Answer to If a baseball was traveling a distance of 60 feet 6 inches at 100mph how long would it take take baseball the baseball to reach home plate in seconds?

Sat, 08 Nov 2008 03:50:00 -0800

If a baseball was traveling a distance of 60 feet 6 inches at 100mph how long would it take take baseball the baseball to reach home plate in seconds?

100 mph is 100*1760*3*12/3600 "/s = 1760 "/s 60'6" is 726" 726/1760 = 0.4125 seconds

Answer to How many numbers of Pi do you know? (3.14 dont count)

Tue, 04 Nov 2008 07:29:17 -0800

How many numbers of Pi do you know? (3.14 dont count)

52: Pi = 3.14159 26535 89793 23846 26433 83279 50288 41971 69399 37510 58...

Answer to Would Penguins survive in the Arctic?

Tue, 04 Nov 2008 07:27:12 -0800

Would Penguins survive in the Arctic?

Penguins would thrive in the Arctic. Penguins feed on fish at the shores of Antarctica, underneath the Arctic there is an ocean full of fish. The only problem would be the polar bears but penguins could flee the polar bear very effectively because penguins are much more adept at swimming than...

Answer to Would Polar Bears survive in Antarctica?

Tue, 04 Nov 2008 07:24:49 -0800

Would Polar Bears survive in Antarctica?

Only on the shores. Thedifference between Antarctica and the Arctic is that there is solid ground under the snow and ice in Antarctica but there is nothing but the Arctic Ocean. Polar bears survive in the Arctic because there is a constant supply of marine life between the iceburgs. In Antarctica...

Answer to Describe the following sequence in mathematical terms. 144, 72, 36, 18, 9

Thu, 23 Oct 2008 06:04:54 -0700

Describe the following sequence in mathematical terms. 144, 72, 36, 18, 9

N=144/2^(n-1)

Answer to The Laws of Physics says matter cannot be created or destroyed - does this mean there is exactly the same amount of matter now as there was a thousand years ago?

Tue, 21 Oct 2008 07:41:59 -0700

The Laws of Physics says matter cannot be created or destroyed - does this mean there is exactly the same amount of matter now as there was a thousand years ago?

No it doesn't. The first Law of Thermodynamics states that the amount of energy in a closed system will not change, i.e. ENERGY cannot be created nor destroyed. Energy makes up matter but can exist in its own right. So the amount of matter now is not necessarily the amount there was a second...

Answer to Many types of plastic are composed of molecules derived from cellulose, but engineers are working hard to develop plastics based on starch molecules, why might starch-based plastics be an improvement over existing types of plastic?

Tue, 21 Oct 2008 07:37:29 -0700

Many types of plastic are composed of molecules derived from cellulose, but engineers are working hard to develop plastics based on starch molecules, why might starch-based plastics be an improvement over existing types of plastic?

By adding starch the biodegrading process is speeded up and can occur without specific conditions.

Answer to Row1 1 row2 3 5 row3 7 9 11 row4 13 15 17 19 row5 21 23 25 27 29 Find the middle number in the 99th row. What is the sum of the numbers in the 30th row?

Tue, 21 Oct 2008 07:08:32 -0700

Row1 1 row2 3 5 row3 7 9 11 row4 13 15 17 19 row5 21 23 25 27 29 Find the middle number in the 99th row. What is the sum of the numbers in the 30th row?

The middle number in each row follows n^2: Row Middle number 1 1 2 (4) 3 9 4 (16) 5 25 Therefore, the middle number of the 99th row is 99^2 = 9801 The sum of the numbers in each row follows n^3: Row Sum 1 1 2 8 3 27 4 64 Therefore, the sum of row 30 is 30^3 =...

Answer to How many different possible combinations can be made from 10 individual fragances?

Mon, 20 Oct 2008 09:18:07 -0700

How many different possible combinations can be made from 10 individual fragances?

10! = 3,628,800

Answer to Compute the area of the convex quaderlateral verticies: (-1,3),(2,0),(2,-1),(-5,-1)

Mon, 20 Oct 2008 09:03:01 -0700

Compute the area of the convex quaderlateral verticies: (-1,3),(2,0),(2,-1),(-5,-1)

Heron's formula: s = .5*a*b*c Area of a triangle = rt(s*(s-a)*(s-b)*(s-c)) a = 3rt2 b = 4rt2 c = rt50 Area of upper triangle ~= rt(8.5(8.5-4.2)(8.5-5.7)(8.5-7.1)) = 12 Area of lower triangle = .5*b*h = .5*7*1 = 3.5 Total area = 12 + 3.5 =15.5 units^2

Answer to The mode, median, and mean of a unimodal distribution were 8, 6, and 4 respectively. This distribution is: a) Symmetric b) Normal c) positively skewed d) negatively skewed. Pick one answer

Mon, 20 Oct 2008 08:32:31 -0700

The mode, median, and mean of a unimodal distribution were 8, 6, and 4 respectively. This distribution is: a) Symmetric b) Normal c) positively skewed d) negatively skewed. Pick one answer

Negatively skewed.

Answer to Why we cannot the the earth more than 30 km? because the chemical compounds or temperature?

Mon, 20 Oct 2008 08:12:41 -0700

Why we cannot the the earth more than 30 km? because the chemical compounds or temperature?

"The continental crust is typically from 30 km (20 mi) to 50 km (30 mi) thick....The temperature of the crust increases with depth, reaching values typically in the range from about 500 °C (900 °F) to 1,000 °C (1,800 °F) at the boundary with the underlying mantle" ...

Answer to Does the cambrian explosion support the idea of evolution?

Mon, 20 Oct 2008 08:04:49 -0700

Does the cambrian explosion support the idea of evolution?

The Cambrian explosion was not as big an explosion as once thought. There is evidence of Precambrian animals becoming more and more evident. I'm not disputing that there was a rapid radiation but not outside the laws of evolution.

Answer to A 1.9 kg block slides down a frictionless ramp...the top of the hill is 1.5 m and the bottom of the hill is 0.25 m above the ground...the block leaves the ramp moving horizontally and lands a horizontal distance d away. Find the distance d.

Mon, 20 Oct 2008 07:54:10 -0700

A 1.9 kg block slides down a frictionless ramp...the top of the hill is 1.5 m and the bottom of the hill is 0.25 m above the ground...the block leaves the ramp moving horizontally and lands a horizontal distance d away. Find the distance d.

First of all, what is the length of the ramp, its magnitude or its angle of inclination? Second of all, if the ramp is straight then the block CANNOT leave its end horizontally. If the ramp is curved then what is the equation of the curve?

Answer to In which country is the city of Nancy?

Mon, 20 Oct 2008 07:49:29 -0700

In which country is the city of Nancy?

France

Answer to Will humans ever live in space or on another planet?

Tue, 14 Oct 2008 07:22:57 -0700

Will humans ever live in space or on another planet?

There are a few logistical problems: 1) Travelling there. Without a faster than light means of travel we will need to build space ships capable of transporting the equivalent of a village of people to continue the existence of the passengers over the vast time it will take to get to an...

Answer to Explain why a person coming out of a shower experiences a chill as he enters into a dry room.?

Sat, 11 Oct 2008 09:05:20 -0700

Explain why a person coming out of a shower experiences a chill as he enters into a dry room.?

The water from the shower has a lower temperature than your body, otherwise you'd feel as if it is scalding you. So to come to an equlibrium the water on your body warms up to your body temperature. Your internal body temperature is constant, so the water dripping off retains some of your...

Answer to HOW TO ROUND 3.8754 TO THREE SIGNIFICANT FIGURES?

Sat, 11 Oct 2008 07:58:13 -0700

HOW TO ROUND 3.8754 TO THREE SIGNIFICANT FIGURES?

3 significant figures means three digits from the leftmost digit that isn't a zero. So 3.8754 will get rounded to 3.88. Another example to demonstrate the non-zero part of significant figures would be rounding 0.0089643 to 3 significant figures. You would get 0.00896 because you go...

Answer to Is the angle DAE the same as DCA if the line AC equals CB & DB is a straight line? See image in first answer.

Wed, 08 Oct 2008 13:41:35 -0700

Is the angle DAE the same as DCA if the line AC equals CB & DB is a straight line? See image in first answer.

Image for question:

Answer to What do the Muslims think about Jesus? Who was he?

Mon, 06 Oct 2008 15:35:37 -0700

What do the Muslims think about Jesus? Who was he?

Muslims consider Jesus of Nazareth to be a profit. A wise and benevolent speaker for Allah. Muslims refute the New Testament's spin on Jesus' actions as being the son of Allah.

Answer to Why are you taught to measure angles in degrees, only to have to switch to radians later on?

Sun, 05 Oct 2008 18:37:20 -0700

Why are you taught to measure angles in degrees, only to have to switch to radians later on?

The Babylonians were among the first to use trigonometry and astronomy. They understood that there were approximately 360 days in a year, based upon the movement of stars around the Pole Star of the time. This seemed like a logical measurement to use when dealing with rotations/circles. Theor...

Answer to Two objects attract each other gravitationally with a force of 2.1×10−10 when they are 0.25 apart. Their total mass is 4.10 .

Sun, 05 Oct 2008 17:33:26 -0700

Two objects attract each other gravitationally with a force of 2.1×10−10 when they are 0.25 apart. Their total mass is 4.10 .

This is not an answer! You have no units, no words/wording that are inherent to a question nor a question mark.

Answer to Whenwill there be robotic parts better than the real thing so I can become a cyborg?

Sun, 05 Oct 2008 17:30:40 -0700

Whenwill there be robotic parts better than the real thing so I can become a cyborg?

It depends upon your level of 'virtue'. For some levels we are already there. For other levels it will take many generations. For me though, I would say never. I am proud to have my imperfections if they are me.

Answer to I worried if i will be able to have a baby because i have had two stds at one time but i still having a period do you think i will be able to care a child

Sun, 05 Oct 2008 17:28:24 -0700

I worried if i will be able to have a baby because i have had two stds at one time but i still having a period do you think i will be able to care a child

It depends upon the STDs. Ask your GP, I'm sure that it is something that even on an anonymous site like this you will still be shy about the details.

Answer to Does ash decompose?

Fri, 03 Oct 2008 08:11:11 -0700

Does ash decompose?

No, well it shouldn't. Ash is the Carbon residue left over from organic material being burnt completely and crumbled. There may be a slight residue of organic material that hasn't completely burnt up that may decompose but it would be negligible.

Answer to Sovle theinerquality x^2+3x>10

Fri, 03 Oct 2008 07:20:33 -0700

Sovle theinerquality x^2+3x>10

x^2 + 3x > 10 x^2 + 3x - 10 > 0 Using factorisation you get two numbers that when multiplied give -10 and when added give 3. Two such numbers would be 5 & -2. (x + 5)*(x - 2) > 0 x > -5 & x > 2. To satisfy these inequalities x > 2.

Answer to Is it a coincidence that I (a Cancer) seem to always fall for a Pisces even before I know their sign?

Wed, 24 Sep 2008 15:50:10 -0700

Is it a coincidence that I (a Cancer) seem to always fall for a Pisces even before I know their sign?

The problem with astrology is 'horoscopes'! Astrology is an observation and horoscopes are a loose extrapolation of that system. It probably isn't a coincidence but you you shouldn't think that astrology is fool proof.

Answer to What kind of outer stimulation activates both sides of the brain at the same time?

Wed, 24 Sep 2008 09:44:51 -0700

What kind of outer stimulation activates both sides of the brain at the same time?

Many, if not all. Our ability to consciously use both sides of our brain is hindered by the size of the corpus colosseum.

Answer to WHY DO THE LEAVES IN Autum dont all change to the same color.

Wed, 24 Sep 2008 09:28:11 -0700

WHY DO THE LEAVES IN Autum dont all change to the same color.

Twilight Hammer is correct in saying that different trees have different levels of particular pigments in them producing different colours at different rates but those that turn tend to turn a very similar colour. The reason why all leaves do not turn a reddish brown is that some trees have...

Answer to Why is it when you do not agree with someone else's idea of truth, you become the hardheaded one who refuses to accept the truth?

Fri, 19 Sep 2008 20:23:43 -0700

Why is it when you do not agree with someone else's idea of truth, you become the hardheaded one who refuses to accept the truth?

The phrase: We only use a tenth of our brain comes from the fact that the conscious part of the brain is ony a few millimeters thick. That does not mean that that is the only part of the brain that is in use, at any given moment a third of the brain is used nut over any given time period all of...

Answer to How Do You Solve 2y+10=5y-4y?

Tue, 16 Sep 2008 16:55:36 -0700

How Do You Solve 2y+10=5y-4y?

2y+10=5y-4y 2y+10=y 2y-y=-10 y=-10

Answer to Relation of sin cos and tan

Mon, 15 Sep 2008 04:46:33 -0700

Relation of sin cos and tan

Sin is the abbreviation of sine. The sine of an angle is the ratio of the side adjacent to the angle in question and the hypotenuse. Cos is the abbreviation of cosine. The cosine of an angle is the ratio of the side opposite the angle in question and the hypotenuse. Tan is the...

Answer to How to determine whether this series is converging? ∞ ∑( (-1)^n ) / (n*2^n) n=0 Could you please show working that would be greatly appreciated. Cheers :)

Sun, 14 Sep 2008 07:53:29 -0700

How to determine whether this series is converging? ∞ ∑( (-1)^n ) / (n*2^n) n=0 Could you please show working that would be greatly appreciated. Cheers :)

A simple expression like this I would work out the first few terms: n=1: (-1)^1/(1*2^1)=-1/2 n=2: (-1)^2/(2*2^2)=1/8 n=3: (-1)^3/(3*2^3)=-1/24 The results are alternating between positive and negative and are getting less and less. Therefore converging to 0. For a more mathematical...

Answer to Name three numbers between 0.33 and 0.34?

Fri, 12 Sep 2008 09:09:58 -0700

Name three numbers between 0.33 and 0.34?

(pi+phi)/14 e+phi-4 (e*rt2)/(pi*phi*rt5)

Answer to Math: discovered or invented?

Fri, 12 Sep 2008 08:51:08 -0700

Math: discovered or invented?

Mathematics is nothing more than logic. As long as there is something for mathematics to apply to then there has been mathematics. Energy cannot be created nor destroyed, according to the 1st Law of Thermodynamics (roughly). So energy has always been and always will, therefore so has/too...

Answer to How big is a single cell?

Fri, 12 Sep 2008 08:24:02 -0700

How big is a single cell?

"a typical cell size is 10 µm" http://en.wikipedia.org/wiki/Cell_(biology)

Answer to How much a cell weights?

Fri, 12 Sep 2008 08:22:49 -0700

How much a cell weights?

"a typical cell mass is 1 nanogram" http://en.wikipedia.org/wiki/Cell_(biology)

Answer to How does nature make sand, and of what?

Fri, 12 Sep 2008 08:20:16 -0700

How does nature make sand, and of what?

Sand is just the shavings of rocks from the ocean that have been smashed together by under water waves.

Answer to Can a person remarry after divorce if the first marriage was done before the person was made catholic?

Fri, 12 Sep 2008 08:17:44 -0700

Can a person remarry after divorce if the first marriage was done before the person was made catholic?

From my understanding of Catholicism I would say 'no'. Whether or not the Catholic church would wholey agree with the sanctity of a marriage outside of Catholicism it would still recognize that it is a promise to God. If you convert to Catholicism then you must adhere to their way of...

Answer to What are the characteristics of an estimate

Sun, 07 Sep 2008 11:02:58 -0700

What are the characteristics of an estimate

An estimate is usually a round number

Answer to Can an object have a positive velocity and a negative displacement? EXPLAIN PLEASE!!!

Sun, 07 Sep 2008 10:33:31 -0700

Can an object have a positive velocity and a negative displacement? EXPLAIN PLEASE!!!

Velocity is quantified by its movement from one position to another in a time frame. Therefore it requires speed and direction. So something moving north at a speed of 1o mph has a velocity of 10 mph going north or -10 mph going south. If something is made up of matter then it will have to...

Answer to In House MD, what episode was it that Wilson read the love note that was left to House from his clinic patient? ( a elderly women)

Thu, 04 Sep 2008 14:00:55 -0700

In House MD, what episode was it that Wilson read the love note that was left to House from his clinic patient? ( a elderly women)

Poison

Answer to My pool is round and is 13 feet in diameter and is 36 inches deep how many gallons of water can it hold?

Wed, 03 Sep 2008 15:00:46 -0700

My pool is round and is 13 feet in diameter and is 36 inches deep how many gallons of water can it hold?

861.8979845 US gallons 717.6802015 Imperial gallons

Answer to Since our proof of the accuracy of the scientific method is simply the claim of accurate results from the scientific method, how do we know that science is correct?

Wed, 03 Sep 2008 05:01:39 -0700

Since our proof of the accuracy of the scientific method is simply the claim of accurate results from the scientific method, how do we know that science is correct?

Repitition. If you were trying to see the chances of a coin landing heads up then you repeat the experiment as often as possible to see a trend as to what the chances are. Same goes for science. An experiment is run, it is repeated and it is repeated at least another time. This way you get...

Answer to In your opinion, is the book of Revelations meant to be interpreted literally or symbolically?

Mon, 01 Sep 2008 09:15:29 -0700

In your opinion, is the book of Revelations meant to be interpreted literally or symbolically?

There is very little in the Bible that should be taken literally.

Answer to If all matter is mostly space between molecules why does this chair feel solid under me (given the fact that I am mostly empty space as well)? I know this is a pretty basic question but is something I can't quite grasp.

Sat, 30 Aug 2008 03:15:41 -0700

If all matter is mostly space between molecules why does this chair feel solid under me (given the fact that I am mostly empty space as well)? I know this is a pretty basic question but is something I can't quite grasp.

Yes, most of us is nothingness. A Hydrogen atom is 25 thousand millionths of a millimeter across. If you zoomed in to make the nucleus appear to be the size of a pin-head then the electron orbiting it would appear to be a kilometer away. Think of things made up of atoms as being like chicken...

Answer to How big is the sahara desert?

Fri, 29 Aug 2008 05:00:52 -0700

How big is the sahara desert?

3.5 million square miles

Answer to Why are there earthquake on earth?

Fri, 29 Aug 2008 04:59:33 -0700

Why are there earthquake on earth?

The Earth's crust is made up of lots of rock pannels called techtonic plates. The places where they meet are constantly being torn apart by the movement of these plates.

Answer to If the Bible is so foolish - why was it not disregarded ages ago and thrown in the dustbin of History?

Tue, 26 Aug 2008 06:30:10 -0700

If the Bible is so foolish - why was it not disregarded ages ago and thrown in the dustbin of History?

When the Bible was compiled it didn't seem so rediculous. Only recently have we proved the Bible wrong on most of its claims. In my opinion, it should be disregarded but so many people have followed it for so many years that old habits die hard. The only religious belief that is constantly...

Answer to Does playing cards haverotational symmetry?

Tue, 26 Aug 2008 06:01:50 -0700

Does playing cards haverotational symmetry?

Some do, it depends upon the designs on the front and back.

Answer to What is an example of inductive reasoning used wrong?

Tue, 26 Aug 2008 05:50:26 -0700

What is an example of inductive reasoning used wrong?

There isn't one. Inductive reasoning is proving something without any assumptions, thus proving it. The method itself is never wrong. Either you make an assumption or a miscalculation to deduce something that isn't correct but then it's not inductment.

Answer to A dartboard has two regions one 5 point and one 7 points. What is the largest score impossible to earn?

Tue, 26 Aug 2008 05:19:09 -0700

A dartboard has two regions one 5 point and one 7 points. What is the largest score impossible to earn?

How many darts? If there's infinite darts then the only score possible is infinity. If there's a finite number of darts then infinity cannot be reached; impossible. Therefore infinity would be the largest.

Answer to Can a man and woman with blue eyes procreate a child with brown eyes?

Tue, 26 Aug 2008 05:08:20 -0700

Can a man and woman with blue eyes procreate a child with brown eyes?

Blue eyes are the result of a recessive gene and brown eyes are the result of a dominant gene. If a persn has blue eyes then their eye colour genes MUST both be the blue gene, otherwise they will have a dominant brown gene and have brown eyes. So the result of two blue eyed people MUST be a blue...

Answer to Can a magnetic field pass through a perfect vacuum?

Wed, 20 Aug 2008 07:58:19 -0700

Can a magnetic field pass through a perfect vacuum?

1) There is no such thing as a perfect vacuum. A vacuum merely has an overall zero mass but in reality there is mass borrowed from the past and future in little pockets within the vaccum. 2) It has been theorized that magnetism is like gravity, its ability to move things is because of it...

Answer to On the Star Trek series, original or extra crispy, when the capt. leaves the bridge what is it he says? is it so and so you have the con ( as in controls) or is he saying so and so you have the comm. (as in command)?

Wed, 20 Aug 2008 07:48:42 -0700

On the Star Trek series, original or extra crispy, when the capt. leaves the bridge what is it he says? is it so and so you have the con ( as in controls) or is he saying so and so you have the comm. (as in command)?

It varies. Sometimes they say "You have the Bridge" "You have command" etc. No specific one is constantly used.

Answer to If cellphones have premium-quality color displays now, why do the newest graphics calculators still come out in monochrome?

Wed, 20 Aug 2008 06:46:54 -0700

If cellphones have premium-quality color displays now, why do the newest graphics calculators still come out in monochrome?

It's superfluous. The only reason why a calculator will need colours are graphs. Graphic calculators are seldom needed. Proper labelling erradicates the necessity of colours.

Answer to Let f(x)=3x+1 and g(x)=2x find (gof)(6).

Wed, 20 Aug 2008 06:38:47 -0700

Let f(x)=3x+1 and g(x)=2x find (gof)(6).

g o f(x) = g(f(x)) g = 2f(x) = 2(3x + 1) = 6x + 2 x = 6 Therefore g o f(6) = 6*6 + 2 = 38

Answer to Can u factorize it? x^4 - 2x^3 + 2x - 1 please explain too

Wed, 20 Aug 2008 06:21:18 -0700

Can u factorize it? x^4 - 2x^3 + 2x - 1 please explain too

(x^2 - 1)(x - 1)^2 = (x^2 - 1)(x^2 - 2x + 1) = x^4 - 2x^3 + x^2 - x^2 + 2x - 1 = x^4 - 2x^3 + 2x - 1 First off I chose (x - 1)(x + 1)^2 because I needed a -1 constant. I knew that I'd be miising a multiple of x so with a little trial and error I got the above.