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Science & Mathematics - 27 November 2006

[Selected]: All categories Science & Mathematics

Agriculture · Alternative · Astronomy & Space · Biology · Botany · Chemistry · Earth Sciences & Geology · Engineering · Geography · Mathematics · Medicine · Other - Science · Physics · Weather · Zoology

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Not considering friction or other forces, how much force, pressure, would it take to push, lift, a 1200 lb. weight up a 45 deg. angle.
I am curious as I saw a weight lifter do this using his legs and thought he was not actually lifting a 1200 lb. resistance.

2006-11-27 05:30:59 · 4 answers · asked by tronary 7 in Engineering

2. Which of the following statements best explains the key difference between velocity and speed?

a. Velocity must be reported in m/s, but speed can have other distance time units.
b. Velocity depends on direction, speed does not.
c. Objects can have different speeds if they are moving with the same velocities, but not different velocities if they are moving with the same speeds.
d. Due to Earth’s gravity, an object’s velocity will always be slightly larger than its speed.

2006-11-27 05:29:03 · 7 answers · asked by Dillon L 1 in Physics

2006-11-27 05:28:48 · 4 answers · asked by richard w 1 in Engineering

A piece of paper 18 cm x 24 cm has to be shrunk proportionally to 4/9 of its area size.

What will be the length and width of the piece of paper after its area has been reduced?

All calculated so far is this:

18 cm X 24 cm = 432 cm² (old area)

4/9 X 432 cm² = 192 cm² (new area)

192 cm² Z cm
------------- = ------------
432 cm² 18 cm

Z cm = 8 cm (width)


I must be doing something really wrong cuz apparently the width = 12 cm and the length = 16 cm.

And Ive just been goin over this a ton of times...but i cant seem to figure it out.

Any ideas? =)

2006-11-27 05:28:38 · 13 answers · asked by Jaded 7 in Mathematics

2006-11-27 05:27:12 · 21 answers · asked by Idea Evangelist 3 in Astronomy & Space

1

I need help with this problem please! Solve for X

x + 3y + 43= 1/2 - 12x + y

2006-11-27 05:26:39 · 4 answers · asked by Help! 1 in Mathematics

my chemistry teacher says theres a gas *not a liquid* that helps gas mileage. just wondering what it is. do you know?

2006-11-27 05:26:24 · 3 answers · asked by Anonymous in Chemistry

1. Velocity is known as a vector quantity. What does this tell us about velocity?

a. Velocity will always be positive.
b. Velocity is instantaneous.
c. Velocity will have size and direction.
d. Velocity is the same as acceleration.

2006-11-27 05:24:16 · 9 answers · asked by Dillon L 1 in Physics

Level : 2nd year university ...

2006-11-27 05:19:41 · 2 answers · asked by jimy86Leb 2 in Physics

I know they still have to be balanced.

FeCl3 + NaCl -> FeCl2 + NaCl3


FeCl3 + NaCl -> FeCl2 + NaCl3

2006-11-27 05:19:18 · 2 answers · asked by ? 2 in Chemistry

Scientists have said if they could make a powerful enough telescope they could see the beginning, the dawn of creation. So I guess it has to do with the ability of being able to surpass the speed of light, as time travels at the speed of light.

Example: The sun we look at is really the sun as it was 8 minutes ago because it is so far away....93,000,000 mi. It's light travels at 86,000 mi per sec.

Many of the stars we see at night don't even exist anymore. They burned up long ago. So we are actually looking at history. Does anyone get my point? If you don't, I'm sure it seems ridiculous. I'd like to see what you have to say.

2006-11-27 05:18:51 · 12 answers · asked by ? 5 in Astronomy & Space

2006-11-27 05:12:52 · 1 answers · asked by rajesh kurian 1 in Engineering

2006-11-27 05:12:52 · 4 answers · asked by Anonymous in Zoology

how about pH of 9.6?

2006-11-27 05:01:07 · 2 answers · asked by Anonymous in Chemistry

Well, do they?

2006-11-27 05:00:35 · 8 answers · asked by playitagainsam 1 in Mathematics

wat is it all 'bout ?wat does a genetic engineer do?

2006-11-27 04:58:28 · 1 answers · asked by ridhi m 2 in Engineering

Expand and simplify:

(4√5 + 5√2)(-√5 - 3√2)

2006-11-27 04:58:13 · 5 answers · asked by thomasgraham880 1 in Mathematics

I wanna know, y Fourier represented any wave in sine & cosine terms & not any other functions other than the exponential..

2006-11-27 04:57:42 · 4 answers · asked by ((Gaining knowledge.) 2 in Engineering

2006-11-27 04:55:10 · 10 answers · asked by Frankz 1 in Botany

2006-11-27 04:54:06 · 7 answers · asked by Anonymous in Mathematics

Thomas is going to make an open-top box by cutting equal squares from the four corners of an 11 inch by 14 inch sheet of cardboard and folding up the sides. If the area of the base is to be 80 square inches, then what size square should be cut from each corner? Please explain your answer. Thanks!

2006-11-27 04:53:36 · 4 answers · asked by sillyboys_trucksare4girls 2 in Mathematics

do you have brands or company that sell it? thanks

2006-11-27 04:52:32 · 1 answers · asked by settemn 2 in Engineering

2006-11-27 04:52:19 · 9 answers · asked by Anonymous in Mathematics

I am doing a project for school and i would like to know what direction to look when it comes to what material is used for drill casings. I have a Ryobi make. It is a cordless drill and it melts when burned. It will catch on fire.

2006-11-27 04:47:37 · 1 answers · asked by Dre 2 in Engineering

a rectangular sheet of metal has dimensions of 250mm x 200mm. A rectangular hole with a distance "x" between it's edges and the edge of the plate is cut into the plate. the effect of adding the hole is to reduce weight of the plate by 60%.

(i) show that the area of the hole can be expressed as 4xsquared - 900x + 50000 = area of hole

(ii) solve the equation for "x" to determine the dimensions for the hole.

(iii) given that the area of the plate is 20000msquared clearly show steps and explain methodology at each point.

2006-11-27 04:46:30 · 2 answers · asked by Anonymous in Engineering

What sound level change corresponds to a factor of two change in intensity?
A. 0.5 dB
B. 2 dB
C. 3 dB
D. 5 dB

2006-11-27 04:42:46 · 2 answers · asked by Anonymous in Physics

picture a rotating hub with inner workings where it creates a centrifugal force. Does this arrangement cause a load on the rotating hub....meaning if this hub was on the ground does centrifugal force impedes how fast or slow this hub moves on the ground? Picture a upright rotating wheel.........but don't pay any mind to what force is rotating it (gas engine, or electric motor etc). I am only interested in whether centrifugal force impedes rotation and if so how much......a formula would do.

2006-11-27 04:41:11 · 3 answers · asked by Anonymous in Engineering

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