Science & Mathematics - 9 December 2007

the volume of paint in a rt. cylindrical can is given by V=4t^2-t where t is time in seconds and V is the volume in cbc.cm. How fast is the level rising when the height is 2cm? the can has a height of 4 cm and a radius of 2. i don't get how you are supposed to solve since the formula doesn't have h, and we need dh/dt

2007-12-09 01:00:04 · 1 answers · asked by Tim H 1 in Mathematics

2007-12-09 00:58:39 · 4 answers · asked by Anonymous in Earth Sciences & Geology

I know it was because the Philippine plate slide under the Eurasian plate.
But does anyone have more detail?
thanks

2007-12-09 00:58:22 · 2 answers · asked by Anonymous in Earth Sciences & Geology

Whatever the derivative is i need to set it equal to zero to optimize it for the minimum.

2007-12-09 00:52:49 · 3 answers · asked by Anonymous in Mathematics

a major-league pitcher can throw a baseball in excess of 37.0 m/s. if a ball is thrown horizontally at this speed, how much will it drop by the time it reaches a catcher who is 17.0m away from the point of release ?

no air resistence
my teacher told me you might need to use the quadratic formula.

if you can show your work, that will be great.

2007-12-09 00:46:11 · 4 answers · asked by Anonymous in Mathematics

will all lights go out?

2007-12-09 00:44:24 · 4 answers · asked by Paul 2 in Engineering

what is it governed by?

2007-12-09 00:40:01 · 2 answers · asked by Paul 2 in Engineering

You always hear of dolphins helping humans out and i've never heard of one attacking. What makes them any different from sharks?

2007-12-09 00:37:34 · 10 answers · asked by quazi742003 2 in Zoology

2007-12-09 00:31:47 · 9 answers · asked by Didy 4 in Weather

i want summary report about difference between modulations technique pluse that i want curves show difference between them axis of curves are signal to noise ratio and probapility of error
wite big thanks for you

2007-12-09 00:29:24 · 1 answers · asked by tota_ e 1 in Engineering

1) 5x+7y= -3
2x+3y= -1

2) 2x+3y=7
8x+12y=2

3) 2x-y+3z=9
x +2z=3
3x+2y+z=10

2007-12-09 00:29:12 · 5 answers · asked by Anonymous in Mathematics

An ideal solution is formed by mixing liquids A and B at 298K. The vapour pressure of pure A is 180 Torr and that of pure B is 82.1 Torr. Assume that there are only A and B molecules in the vapour phase.
If the mole fraction of A in the vapour is 0.450, what is the mole fraction of A in the solution?

- much appreciated any help ne1 can give, iv been tearing my hair out and am now bald becos of this question :(

2007-12-09 00:21:27 · 1 answers · asked by Anonymous in Chemistry

A molar mass from freezing-point depression experiment

2007-12-09 00:20:17 · 1 answers · asked by Fafa 3 in Chemistry

our world seems worse every day with global warming, pollution and littering. is the world coming to an end?

2007-12-09 00:14:45 · 5 answers · asked by Lindsayyy 3 in Earth Sciences & Geology

2007-12-09 00:12:58 · 1 answers · asked by Rogelio V 2 in Chemistry

4) A ball is thrown vertically upwards with a speed of 10ms. Find (a) the highest point it reaches. (b) the total time it is in the air.

The answer to part a i have got as 5.10m which is correct.

However i don't know how to get (b).
The answer in the back of the book for that is 2.04 seconds but i don't know how they got that. PLEASE helpppppppppppppp...

2007-12-09 00:09:21 · 1 answers · asked by Bo 3 in Mathematics