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July 24, 2014

Homework Help: physics(check my answer)

Posted by phys on Wednesday, March 31, 2010 at 2:34am.

A 60.0 kg person bends his knees and then
jumps straight up. After his feet leave the floor, his motion is
unaffected by air resistance and his center of mass rises by a maximum
of 14.9 cm. Model the floor as completely solid and motionless.

(a) Does the floor impart impulse to the person?
Yes, am i correct to this part

(b) Does the floor do work on the person?
yes, since the floor exerts a force along the distance he jump, am i correct?

(c) With what momentum does the person leave the floor?
This part i'm stuck since p=mv, but i dont know how to find v in this case. Can you help me how to start it

(d) Does it make sense to say that this momentum came from the floor? Explain your answer.
Yes, since the guy exerts momentum on the floor, the floor also exerts same momentum in opposite direction
(e) With what kinetic energy does the person leave the floor?
do we use k=1/2mv^2, but again im stuck with finding velocity

(f) Does it make sense to say that this energy came from the floor? Explain your answer.
hm..how do you explain this part then

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