Re: Physics Student Needs Help
From: AC (qqq_at_dewy.com.au)
Date: 11/08/04
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Date: Mon, 08 Nov 2004 20:00:16 GMT
www.artsci.gmcc.ab.ca/courses/ Phys124oa/Assig%206%20Solutions%20(2004).pdf
"kimberly" <tinwoods@aol.com> wrote in message
news:b0e3f6be.0410161629.4e7947ff@posting.google.com...
> Hi, I am a physics student and I need help on a couple of problems. I
> hope that no one is annoyed by me posting these here. No one has been
> able to help me yet, and I feel like I am close to solving the
> problems but am missing a step or two in each of them. Any help you
> can provide me would be very very very much appreciated.
>
> 1. A student (m = 63 kg) falls freely from rest and strikes the
> ground. During the collision with the ground, he comes to rest in a
> time of 0.010 s. The average force exerted on him by the ground is
> 18000 N, where the upward direction is taken to be the positive
> direction. From what height did the student fall? Assume that the only
> force acting on him during the collision is that due to the ground.
>
> I know that the answer is 0.42 m, but I do not know how to get there.
>
> 2. A .500 kg ball is dropped from rest at a point 1.20 m above the
> floor. The ball rebounds straight upward to a height of 0.700 m. What
> are the magnitude and direction of the impulse of the net force
> applied to the ball during the collision with the floor.
>
> Once again, I know the answer is 4.28 N but I do not know how to get
> there.
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