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Question

A body of weight w placed on an inclined plane is acted upon by a force P
parallel to the plane which causes the body just to move up the plane.
If the angle of inclination of the plane is `theta` and angle of friction is`psi` , the minimum value of P, is


Options:
A .  `(W sin (psi - theta))/(cos psi)`
B .  `(W sin (theta - psi))/(cos psi)`
C .  `(W cos(theta + psi))/(cos psi)`
D .  `(W sin theta cos (theta - psi))/(sin psi)`
Answer: Option B



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