Posted by sophie on Wednesday, May 16, 2012 at 1:34am.
Is the 44 degrees measured with respect to the ground or the door?
This is very similar to a problem asked yesterday, except that there is friction between board and door this time.
M1= m•g•L•cosα/2,
M2 = F•L•sinα,
M3 = F(fr) •L•cosα = μ•F•L• cosα,
M2 = M1 +M3,
F•L•sinα = m•g•L•cosα/2 + μ•F•L• cosα,
F•sinα - μ•F•cosα = m•g•cosα/2,
F = m•g•cosα/2•( sinα - μ•cosα) =
=63•9.8•cos44º/2•(sin44º - 0.44•cos44º) = 588 N.
If you have the answer for this problem write it.
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