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In the figure, a uniform plank, with a
length L and a weight of W, rests on the
ground and against a frictionless roller
at the top of a wall of height h. The
plank remains in equilibrium for any
value of 000 or more, but slips if
=
000. Find the coefficient of static
friction between the plank and the
ground.
NOTE: Give your answer in terms of the variables given.
flg =
L
0
Roller
h

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