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August 28, 2014

Homework Help: physics

Posted by Elisa on Friday, July 11, 2008 at 8:08am.

1. It has been suggested that rotating cylinders about 11 mi long and 5.2 mi in diameter be placed in space and used as colonies. What angular speed must such a cylinder have so that the centripetal acceleration at its surface equals the free-fall acceleration on Earth?

2. If the torque required to loosen a nut that is holding a flat tire in place on a car has a magnitude of 52.0 Nm, what minimum force must be exerted by the mechanic at the end of a 37.0 cm lug wrench to accomplish the task?

3. A coordinate system (in meters) is constructed on the surface of a pool table, and three objects are placed on the table as follows: a 9.0 kg object at the origin of the coordinate system, a 10.0 kg object at (0, 2.0), and a 17.0 kg object at (4.0, 0). Find the resultant gravitational force exerted by the other two objects on the object at the origin.

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