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
A
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