Tuesday
March 31, 2015

Homework Help: Physic

Posted by Einstein on Friday, December 14, 2007 at 1:50pm.

A 65 kg dancer leaps .32 m high.

a) With what momentum does the dancer reach the ground?

b) What impulse is needed to make a stop?

c) As the dancer lands, the knees bend, lengthening the stopping time to .050 s. Find the average force exerted on the body.

d) Compare the stopping force to the performer's weight.

Thoughts: Momentum equals mass multiplied by the change in velocity. Impulse is the force multiplied by time.

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