Science & Mathematics - 24 November 2006

I mean there are those who use their hands fingers, knuckles, and all to easily do multiplication or long additions. Any easy way to do it?

2006-11-24 09:43:20 · 2 answers · asked by Anonymous in Mathematics

a ball on the end of a string is revolved at the uniform rate in a vertical circle of radius 72.0 cm. if its speed is 4 .00m/s and its mass is 0.300 kg, calculate the tension in the string when the ball ia (A) at top of its path and (B) at the bottom of its path.

2006-11-24 09:42:10 · 3 answers · asked by Luis M 1 in Physics

The hands of a watch are at an exactly equal angle to the vertical axis throug the pivot point of the hands, like arms opened invitingly to the buyer.
a)What is the exact time on this watch?

The hands are symmetrical with regard to the horizontal axis through the pivot point of the hands and the little hand is near the 8.
b) What is the exact time?

2006-11-24 09:41:22 · 4 answers · asked by Anonymous in Mathematics

It takes infinate amounts of energy to travel at the speed of light.

If you are travelling faster than the speed of light however, does it require infinate energy to maintain this speed. Or would it require infinate energy to travel slower than the speed of light.

2006-11-24 09:40:37 · 7 answers · asked by Dave 1 in Astronomy & Space

calculate the centripetal acceleration oh the earth in its orbit around the sun,and the net force exerted on the earth. What exerts this force on the Earth? Assume that the Earth's orbit is a circle of radious 1.50 x10 to the 11th.

2006-11-24 09:37:48 · 2 answers · asked by Luis M 1 in Physics

Due to a defect the little hand begins to go the wrong way in the middle of the night at 0 o'clock (midnight). The big hand, however, continues movig in the right direction. Calculate now what times the hands of this clock will lie exactly on top of each other.

2006-11-24 09:37:02 · 3 answers · asked by Anonymous in Mathematics

2006-11-24 09:36:15 · 1 answers · asked by Anonymous in Botany

2006-11-24 09:27:24 · 2 answers · asked by Ophelia 2 in Biology

And if so when and why was it changed? I'm sure when I was at school many years ago it was called the latter!

2006-11-24 09:25:51 · 5 answers · asked by Anonymous in Earth Sciences & Geology

2006-11-24 09:22:54 · 7 answers · asked by Anonymous in Biology

2006-11-24 09:16:28 · 3 answers · asked by curlash 1 in Chemistry

Suppose f:[-a, a] --> R is either an even or an odd function. Show that S(from 0 to x) f(s)ds is therefore either an odd or an even function, respectively.

* I could put integral symbol here, so 'S' is integral symbol so 0 would be subscript and x would be superscript.

Thank you!!!

2006-11-24 09:15:46 · 3 answers · asked by Eric 1 in Mathematics

A painting is 6 cm longer than it is wide. the painting is to be surrounded by a mat that is 2 cm wide and covered by a piece of glass with area 352 cm squared. find the dimensions of the painting. can you help me?

2006-11-24 09:15:03 · 4 answers · asked by Anonymous in Mathematics

2006-11-24 09:13:20 · 21 answers · asked by gustra49 1 in Geography

i need to know what part of a cell is like what part of a restaurant

2006-11-24 09:12:30 · 4 answers · asked by missy 1 in Biology

It's bright blue, oval gel or liquid filled capsule. It has "AS + DC" printed on one side in white lettering.

2006-11-24 09:08:09 · 4 answers · asked by mirabug 2 in Medicine

The integral of x^2 / sqrt(1-x) dx


Please show your work. Thank you. ;)

2006-11-24 09:04:52 · 4 answers · asked by ANON 1 in Mathematics

HELP PLEASE!!!

The bottom of a box is a rectangle witha length of five cm more than the width. the height of the box is four cm and its volume is 264 cm cubed. find the dimensions of the box.

2006-11-24 09:03:59 · 7 answers · asked by Anonymous in Mathematics

In a purely"Survival of the Fittest"setting,I imagine our ancestors sleeping,eating,digesting food,mating,gestating,giving birth and being born but as a result of these activities being prone to attack and therefore more likely to lose their life.
It seems to me that the most successful organisms should be very sturdy - even if they suffer damage in some small way,they can still carry on as though nothing has happpened; should be ones that contain both sex organs in one body so that no unnecessary contact with other members of the species is required; can make use of their immediate environment for food, water, etc; should be able to withstand relative weather extremes; should live a very, very long life, producing many offspring. So why do we seem to be at the top of the evolutionary tree and not trees themselves (especially since they are used as a simple and elegant model of evolution.)
I'm probably being very obtuse, but I AM new to evolution and maybe don't know as much as you.

2006-11-24 08:58:57 · 20 answers · asked by Anonymous in Other - Science

2006-11-24 08:52:42 · 7 answers · asked by curlash 1 in Chemistry

f(x)=x^4+x^3-7x^2-13x-6. and find all of the roots of f?

g(x)=x^5+5x^4+10x^3+10x^2+5x+1 & roots of g?

thanks!

2006-11-24 08:51:39 · 3 answers · asked by chimstr 1 in Mathematics

Suppose S is an unbiased estimator of θ if E[S] = θ, otherwise it was biased, with bias = E[S] – θ. Find an unbiased estimator of the area (A) of a square plate with sides of length L. Suppose that we make two independent measurements L(1), L(2) of the length of the sides of the plate. Suppose that L (I) is Normally distributed with mean L and variance σ^2. Let your first estimator of A be the square of the average length of the two measurements and let your second estimator be the average of the squares of the first measurement and the second measurement. That is,
S(1) = [0.5(L(1)+ L(2))]^2 and S(2) = [0.5(L^2(1) + L^2(2))]. Which of these estimators has the least bias? If both are biased, can you think of a third estimator that is unbiased?

Well, I know that if X and Y are two independent random variables then E[XY] = E[X]E[Y], and that VAR[X] = E[X2]-[E[X]]^2

Any ideas?

Thanks!

2006-11-24 08:49:58 · 2 answers · asked by abe_cooldude 1 in Mathematics

2006-11-24 08:48:31 · 1 answers · asked by Anonymous in Geography

2006-11-24 08:47:37 · 5 answers · asked by BEN W 1 in Weather

2006-11-24 08:46:32 · 8 answers · asked by curlash 1 in Chemistry

2006-11-24 08:44:36 · 13 answers · asked by Anonymous in Geography

2sin2x-2cosx-sinx=1

I don't see a way to factor or cancel out anything. any help will be appreciated!:)

2006-11-24 08:44:22 · 4 answers · asked by nmrufus 1 in Mathematics

and is the mass of a light wave composed of freq's simular to soundwaves? and is there a physical analogous comparison of light waves to sound waves?

2006-11-24 08:43:47 · 7 answers · asked by Anonymous in Physics

What is the length of r?

2006-11-24 08:41:24 · 3 answers · asked by victoria 1 in Mathematics

dont say an atom neutron, etc
theyre all made up of something

2006-11-24 08:38:20 · 11 answers · asked by Strife 2 in Physics