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Question

A body of weight W
is required to move up on rough inclined plane whose angle of
inclination with the horizontal is `alpha`The effort applied parallel to the
plane is given by(where `mu`= tan`phi` = Coefficient of friction between the
plane and the body.)


Options:
A .  P = W tan`alpha`
B .  P = W tan(`alpha` + `phi`)
C .  P = W (sin`alpha` +`mu`cos`alpha`)
D .  P = W (cos`alpha` +`mu`sin`alpha`)
Answer: Option C



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