A system of blocks and a frictionless pulley is shown in the figure. Block A has a mass of 2.0 kg and is on a rough horizontal surface for which s = 0.40 between the surface and block A.
The rope pulls horizontally on block A. Block C has a mass of 1.0 kg. An external force P = 23.0 N, applied vertically to block A, maintains the system at rest as shown in the figure. What is the friction force on block A?
A) 6.3 N
B) 6.9 N
C) 7.5 N
D) 5.7 N
E) 5.1 N
Question 2
Two blocks are connected by a string that goes over an ideal pulley as shown in the figure and pulls on block A parallel to the surface of the plane.
Block A has a mass of 3.00 kg and can slide along a rough plane inclined 30.0 to the horizontal. The coefficient of static friction between block A and the plane is 0.400. What mass should block B have in order to start block A sliding up the plane?
What will be an ideal response?
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