In the given diagram, with what force must the man pull the rope to hold the plank in position? Weight of the man is 60 kgf. Neglect the weights of plank, rope and pulley.
Text Solution
Verified by ExpertsThe correct answer is:
A
The conditions of equilibrium
Man, on the plank as a system
For plank as a system
Substitute T from eq i in eq ii we get 
now substitute N in eq i
Thus, force applied is 15 kgf
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