A 12 kg block of steel is at rest on ahorizontal table. The coefficient of static friction between blockand table is 0.60.
a) What is the magnitude of the horizontal force that will put the block on the verge of moving?
b) What is the magnitude of a force acting upward 60° from the horizontal that will put the block on the verge of moving?
c) If the force acts down at 60° from the horizontal, how large can its magnitude be without causing the block to move?