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April 25, 2015

Homework Help: Physics

Posted by Nikita on Tuesday, November 17, 2009 at 10:05pm.

A massless string runs around two massless, frictionless pulleys, where one pulley is attached to the ceiling, and the other is suspended with a mass m. An object with mass m = 17 kg hangs from one pulley. A force F is exerted on the free end of the string to lift the object at a constant speed by a distance of 2.9 m. What is the work done on the object by the force F? Hint: Use the lower pulley and the attached object as the system and note that the force F is the tension in the string.

_______Ceiling
* |
0 |
| | |
| | |
| | |
| | |
| |*|
F 0
17KG (mass hanging from pulley)

F is external force pulling the string that runs over the pulley. * is a pulley one attached to the ceiling the other hanging. object of mass m=17kg hanging from string.
0

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