A block of weight W rests on horizontal floor with coefficient of static friction mu. It is desired to make the block move by applying minimum amount of force. The angle thetafrom the horizontal at which the force should be applied and the magnitude F of the force is

A block of weight W rests on horizontal floor with coefficient of stat

1.	A block of weight W rests on horizontal floor with coefficient of static friction mu. It is desired to make the block move by applying minimum amount of force. The angle thetafrom the horizontal at which the force should be applied and the magnitude F of the force is
Answer» `theta = 0,F = MU W` `theta = tan^(-1) , F = (mu W)/(SQRT(1+mu^2))` `theta = tan^(-1) (1/mu) , F = (MUW)/(sqrt(1+mu^2))` `theta = tan^(-1) ((mu)/(1+mu)),F= (muW)/(1+mu^2)` Answer :B