問題詳情
77. A 4.00 kg block rests between the floor and a 3.00 kg block as shown in the figurebelow. The 3.00 kg block is tied to a wall by a horizontal rope. If the coefficient of staticfriction is 0.800 between each pair of surfaces in contact, what horizontal force F mustbe applied to the block to make it move?
(A) 16.2 N
(B) 23.5 N
(C) 54.9 N
(D) 78.4 N