Three blocks, connecting ropes, and a light frictionless pulley comprise a system, as shown. An external force P is applied downward on block A. The system accelerates at the rate of 2.5 m/s 2 . The tension in the rope connecting block B and block C equals 60 N.
-In the figure above,the external force P is closest to:
A)170 N
B)190 N
C)210 N
D)230 N
E)250 N

Question

Three blocks, connecting ropes, and a light frictionless pulley comprise a system, as shown. An external force P is applied downward on block A. The system accelerates at the rate of 2.5 m/s 2 . The tension in the rope connecting block B and block C equals 60 N.
-In the figure above,the external force P is closest to:
A)170 N 
B)190 N 
C)210 N 
D)230 N 
E)250 N

Quizplus · Accepted Answer

The Answer of 
Three blocks, connecting ropes, and a light frictionless pulley comprise a system, as shown. An external force P is applied downward on block A. The system accelerates at the rate of 2.5 m/s 2 . The tension in the rope connecting block B and block C equals 60 N.
-In the figure above,the external force P is closest to:
A)170 N 
B)190 N 
C)210 N 
D)230 N 
E)250 N

Three Blocks, Connecting Ropes, and a Light Frictionless Pulley Comprise