Author Question: Blocks A and B of masses 14 kg and 15 kg, respectively, are connected by a rope, which passes over a ... (Read 106 times)

casperchen82 · **on:** Jul 29, 2018

Blocks A and B of masses 14 kg and 15 kg, respectively, are connected by a rope, which passes over a light frictionless pulley, as shown.

The horizontal surface is rough. The coefficients of static and kinetic friction are 0.40 and 0.20, respectively. External forces P and Q act on block B, as shown. In Figure 5.20, force Q equals zero. The force P, for which block B is on the verge of moving, is closest to:
A) 200 N
B) 540 N
C) 310 N
D) 1,200 N
E) 400 N

Question 2

Blocks A and B of masses 18 kg and 19 kg, respectively, are connected by a rope, which passes over a light frictionless pulley, as shown.

The horizontal surface is rough. The coefficients of static and kinetic friction are 0.40 and 0.20, respectively. External forces P and Q act on block B, as shown. In Figure 5.20, force P equals 76 N. The force Q for which the block descends at constant speed is closest to:
A) 120 N
B) 130 N
C) 140 N
D) 160 N
E) 72 N