65 In Fig. 7-45, a cord runs around two massless, frictionless pul-leys. A canister with mass m = 20 kg hangs from one pulley, andyou exert a force F on the free end of the cord. (a) What must bethe magnitude of F if you are to lift the canister at a constantspeed? (b) To lift the canister by 2.0 cm, how far must you pull thefree end of the cord? During that lift, what is the work done on thecanister by (c) your force (via the cord) and (d) the gravitationalforce? (Hint: When a cord loops around a pulley as shown, it pullson the pulley with a net force that is twice the tension in the cord.)FVFig. 7-45 Problem 65.

Given: The mass of the canister is m = 20 kg. The acceleration due to gravity g = 9.8 m/s2.

Answered: 65 In Fig. 7-45, a cord runs around two…

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