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April 26, 2015

Homework Help: physics

Posted by Mischa on Tuesday, March 20, 2007 at 7:50pm.

A bird perched on a swing the sits 8 cm below a bar has a mass of 52 g, and the base of the swing has a mass of 153 g. The swing and bird are originally at rest, and then the bird takes of horizontally at 2 m/s. How high will the base of the swing rise above its original level (disregard friction)?

Use conservation of momentum:

massbird(vbird)=massswing*velswing

then, having the velocit of swing, determine its KEnergy. That kE will equal gravitational PE, or mgh.

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