Posted by Jess on Tuesday, October 16, 2007 at 7:41pm.
please check my answers.
17. explain how the sport of pole vaulting dramatically changed when flexible fiberglass poles replaced still wodden poles?
the fiberglass poles had more momentum and PE than still wooden poles?
20. does the international space station have gravitational pe? ke? explain?
It has gravitation pe, but I am stuck as to why?
25. what does the work theorem say about the speed of a satillite in circular orbit? (this one I don't understand)
30.a moving hammer hits a nail and drives it into a wall. if the hammer hits the nail with twice the speed, how much deeper will the nail be driven? if it hits with three times the speed?
would it be three times the speed

physics problems  bobpursley, Tuesday, October 16, 2007 at 7:54pm
no, yes but why, no , no
fiberglass poles can store energy (from horizontal velocity) and transfer it upward.
Gravational PE occurs when two bodies are separated, right?
The satellite in orbit uses no energy.
work = velocity^2
force*distance=velocity^2
distance is proportional to velocity^2
so what is twice square?
Answer This Question
Related Questions
 MagnetsPhysics  I have a few questions that I am not too sure of. why is it ...
 Science  Physical  Earth's magnetic field induces some degree of magnetism in ...
 Algebra  A wire is run between two tips of two poles. One pole is 23 ft. taller...
 math  On the side of a parade ground there are two flag poles. The first is 11m...
 geometry  Two poles, 60 feet tall and 20 feet tall, stand on opposite sides of ...
 Physics  A 980N painter stands on a uniform 230N board supported by 2 wooden ...
 algebra  dan has 6 worms on each pole and gary has 11 worms on each pole there ...
 physics  why does the earth have a magnetic declination? a. the earth's axis of...
 science  Amanda is holding a compass and notices that the north pole of the ...
 Math  Ranchers in Sweetwater, Texas hold a rattlesnake round up each year. The ...
More Related Questions