Asked by nick
an 85kg concrete block rests on a flat surface with coefficient of static friction us=0.42. find the maximum force that can pull on the block with, angle of 38 degrees above the horizontal without moving the block?
please help and show work
please help and show work
Answers
Answered by
Henry
M*g = 85 * 9.8 = 833 N. = Wt. of block.
Fn = Mg-F*sin38 = 833 - 0.616F = Normal force.
F*Cos38-u*Fn = M*a.
0.788F - 0.42(833-0.616F) = M*0 = 0, 0.788F - 349.9+0.259F = 0,
1.047F = 349.9, F = 334.3 N.
Fn = Mg-F*sin38 = 833 - 0.616F = Normal force.
F*Cos38-u*Fn = M*a.
0.788F - 0.42(833-0.616F) = M*0 = 0, 0.788F - 349.9+0.259F = 0,
1.047F = 349.9, F = 334.3 N.
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