Science & Mathematics - 22 October 2007

Hi. Is there a formula somewhere in physics (I'm guessing it would be quite basic) which shows the relationship between momentum (Mass x Velocity) and height. The reason I ask relates to a physicist named Robert Goddard. He did as follows:

" In 1915, as assistant professor at Clark University, Worcester, he began experiments on the efficiency of rockets. He bought some commercial rockets and measured their thrust using a ballistic pendulum, a heavy mass suspended by ropes, to which the rocket was attached. The rocket was fired, and the height to which the pendulum rose provided a measure of the total momentum (mass times velocity) imparted to it. Goddard also used an equivalent set-up, where the mass pushed against a spring, instead of being suspended."
http://www.phy6.org/stargaze/Sgoddard.htm

So, I basically want to know, whats the mathematical formula or relationship that he used.

Thanks

2007-10-22 00:35:39 · 1 answers · asked by Anonymous in Physics

2007-10-22 00:20:43 · 4 answers · asked by johnny N 3 in Earth Sciences & Geology

The weight of the block is 80 N. The coefficient of static friction between the block and the vertical wall is .60. a) What minimum force is required to prevent the block from sliding down the wall? and b) What minimum force F is required to start the block moving up the wall?


|
__|
> |__|
/ |
/ 40.0 |
angle

Sorry if the picture doesn't make a lot of sense. It shows the block on the wall, and force being applied at an angle of 40 degrees.

2007-10-22 00:18:43 · 2 answers · asked by Lolly 2 in Physics

but only for research purposes? Or should they be allowed to go even further, and create manimals

2007-10-22 00:13:56 · 6 answers · asked by choc 1 in Biology