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posted by  felix-Q on 11/4/2009 7:01:59 PM  |  status: Live  |  Earned Karma: 67

urgent energy and work assignment question !

Course Textbook Chapter Problem Needs by
General Physics N/A N/A N/A 11/4/2009 at 11:00:00 PM
Question Details:
12. [1pt] A cord runs around two massless and frictionless pulleys. A 1.31 kg canister hangs from one pulley. Find the magnitude of the force F you have to apply to the free end of the cord if you are to lift the canister with constant speed.

13. [1pt] What is the work you do while lifting the canister 3.70 cm?
14. [1pt] What is the work done by the weight of the canister?
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posted by zsm28 on 11/4/2009 8:48:20 PM  |  status: Live
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Response Details:
m = 1.31 kg, d = 3.70 cm
12. F = mg/2 = 6.42 N
13. F*2*d = 0.475 J
14. -mgd = -0.475 J
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