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November 26, 2014

Homework Help: Physics

Posted by Elaine Jetton on Sunday, September 18, 2011 at 9:01pm.

A 1200-N crate is being pushed across a level floor at a constant speed by a force of 260 N at an angle of 20.0 below the horizontal.
(a) What is the coefficient of kinetic friction between the crate and the floor?
(b) If the 260 N force is instead pulling the block at an angle of 20.0 above the horizontal as shown in the figure, what will be the acceleration of the crate? Assume that the coefficient of friction is the same as that found in part (a).
For (a) I got .489, which is wrong. Since I cannot figure out (a) I cannot figure out (b).

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