Saturday
November 22, 2014

Homework Help: physics (Newton's Laws)

Posted by Kathy on Sunday, March 17, 2013 at 9:27pm.

Please help,
A cat is stuck in a tree. You are designated with the job to get it out, yet you do not want to climb the tree, because you may get stuck as well. Instead you set up a pulley system. A rope (consider it massless) runs from the seat you sit on over an ideal pulley and then to your hand. You pull on the loose end of the rope with a force of 348 N. You weigh 612 N and the seat you sit on weighs 16.0 N. (a) What is your acceleration? (b) What force does the seat exert on you?
a)____ m/s^2
b)____ N
I answered:
a) 43.69 m/s^2
B)612 N (using Newton 3rd law)
But both were incorrect. I don't know why.

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