Question: In Fig. E6.7 assume that there is no friction force on the 20.0-N block that sits on the tabletop. The pulley is light and frictionless.

In Fig. E6.7 assume that there is no friction force on the 20.0-N block that sits on the tabletop. The pulley is light and frictionless.

(a) Calculate the tension T in the light string that connects the blocks.

(b) For a displacement in which the 12.0-N block descends 1.20 m, calculate the total work done on (i) the 20.0-N block and (ii) the 12.0-N block.

(c) For the displacement in part (b), calculate the total work done on the system of the two blocks. How does your answer compare to the work done on the 12.0-N block by gravity?

(d) If the system is released from rest, what is the speed of the 12.0-N block when it has descended 1.20 m?

Figure E6.7:

20.0 12.0 N

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