A simple pendulum has a mass of 0.21 kg and a length of 1.9 m.It is displaced through an angle of 36° and then released.After a time,the maximum angle of swing is only 12°.How much energy has been lost to friction?

A) 0.66 J
B) 0.75 J
C) 0.09 J
D) 1.00 J
E) 0.83 J

Question

A simple pendulum has a mass of 0.21 kg and a length of 1.9 m.It is displaced through an angle of 36° and then released.After a time,the maximum angle of swing is only 12°.How much energy has been lost to friction?
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A) 0.66 J
B) 0.75 J
C) 0.09 J
D) 1.00 J
E) 0.83 J

Quizplus · Accepted Answer

The energy lost to friction can be calculated by finding the difference in potential energy at the two maximum angles. The initial potential energy is mgh, where h is the height corresponding to the initial angle, and the final potential energy is mgh for the final angle. The difference gives the energy lost.

A Simple Pendulum Has a Mass of 0