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May 27, 2015

Homework Help: College Physics

Posted by Kyle on Wednesday, March 3, 2010 at 9:49pm.

Part A) A 2.2 kg rock is released from rest at the surface of a pond 1.8 m deep. As the rock falls, a constant upward force of 5.0 N is exerted on it by water resistance. Let y=0 be at the bottom of the pond. Calculate the nonconservative work, Wnc , done by water resistance on the rock, the gravitational potential energy of the system, U , the kinetic energy of the rock, K , and the total mechanical energy of the system, E , when the depth of the rock below the water's surface is 0 m.
Part B) What is the Wnc of the water resistance on the rock, U, K, and E when the rock is 0.50 m below the surface?
Part C) What is the Wnc of the water resistance on the rock, U, K, and E when the rock is 1.0 m below the surface?

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