question_answer

Pulling force making an angle \[\theta \] to the horizontal is applied on a block of weight W placed on a horizontal table. If the angle of friction is \[\alpha \], then the magnitude of force required to move the body is equal to                          [EAMCET 1987]

A)                         \[\frac{W\sin \alpha }{g\tan (\theta -\alpha )}\]            

B)                           \[\frac{W\cos \alpha }{\cos (\theta -\alpha )}\]            

C)                         \[\frac{W\sin \alpha }{\cos (\theta -\alpha )}\]            

D)                         \[\frac{W\tan \alpha }{\sin (\theta -\alpha )}\]