b) In the figure below, a unitorm plank, of W 325 N, rests on the ground and against a frictionless roller at the %3D top of a wall of height h = 3.5 m. The plank remains in equilibrium for any value of 6 > 60° but slips if 6 < 60°. %3D i. Draw a force diagram for the plank. ii. By considering balance of torques show that the force exerted by the roller on the plank is 130 N. iii. Find the coefficient of static friction between the plank and the ground.
b) In the figure below, a unitorm plank, of W 325 N, rests on the ground and against a frictionless roller at the %3D top of a wall of height h = 3.5 m. The plank remains in equilibrium for any value of 6 > 60° but slips if 6 < 60°. %3D i. Draw a force diagram for the plank. ii. By considering balance of torques show that the force exerted by the roller on the plank is 130 N. iii. Find the coefficient of static friction between the plank and the ground.
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Transcribed Image Text:(b) In the figure below, a uniform plank, with a length L = 6.5 m and a weight
325 N, rests on the ground and against a frictionless roller at the
3.5 m. The plank remains in equilibrium for
of W
top of a wall of height h
any value of 0 > 60° but slips if 0 < 60°.
i. Draw a force diagram for the plank.
ii. By considering balance of torques show that the force exerted by the
roller on the plank is 130 N.
iii. Find the coefficient of static friction between the plank and the
ground.
Roller
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