Blocks A and B of masses 14 kg and 15 kg, respectively, are ...

[casperchen82]

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

[mbcrismon]

Answer to Question 1

A

Answer to Question 2

A

[casperchen82]

Gracias!

[pratush dev]

TYSM