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Unread 27-01-2005, 09:26
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Re: Stupid physics problem.

Quote:
Originally Posted by Adam Y.
A window washer pulls herself upward using the bucket-pulley apparatus shown in Fig. 4-40. The mass of the person plus the bucket is 64 kg. The person pulls themselves up the rope on the other side of the pully. Assuming friction doesn't apply. What is the force needed to pull the person up with a constant velocity?
If friction doesn't apply, the person can't grip the rope and can't pull herself up at all.

Quote:
Originally Posted by russell
I have never taken physics, so feel free to ignore this but I would think that if she was pulling down with force equal to that with which gravity acts on her body then she would not go anywhere at all. She would stay exactly where she was. In order for there to be no acceleration (or constant velocity) all she would have to do is pull with constant force.
That's not correct. Read up on Newton's second law.
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