problem11_72

# University Physics with Modern Physics with Mastering Physics (11th Edition)

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11.72: a) Take torques about the upper corner of the curb. The force F acts at a perpendicular distance h R - and the weight acts at a perpendicular distance ( 29 . 2 2 2 2 h Rh h R R - = - - Setting the torques equal for the minimum necessary force, . 2 2 h R h Rh mg F - - = b) The torque due to gravity is the same, but the force
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Unformatted text preview: F acts at a perpendicular distance , 2 h R-so the minimum force is hv Rh mg-2 ) ( /2 R–h . c) Less force is required when the force is applied at the top of the wheel....
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