Do Mastering Physics online HW15 by 8:00am Friday morning AND work out the follo

Question

Do Mastering Physics online HW15 by 8:00am Friday morning AND work out the following problems to turn in on Friday in lecture Knocking Over a Post - One end of a post of mass M and with height H rests on a rough horizontal surface. The coefficient of static friction between the post and the surface is mu. The upper end of the post is held by a massless rope fastened to the surface and making an angle 6 with the post, as shown in the figure. A horizontal force F is exerted on the post as shown. Your intuition tells you that the force is trying to knock over the post. However, if the point of application of the force is higher than some critical height above the ground, the post cannot be made to slip, no matter how great the force. Find the critical height h in terms of the symbols given.

Explanation / Answer

torque about top of the post must be zero

F h = M g H

>>> h = M g H/F

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