In conditions of the previous problem find the frequency and the period of the variation of kinetic energy.

In conditions of the previous problem find the frequency and the perio

1.	In conditions of the previous problem find the frequency and the period of the variation of kinetic energy.
Answer» Solution :The EXPRESSION for the kinetic energy is TRANSFORMED as follows: `K=2.50cos^(2)(20pit+(3pi)/(4))=1.25[1+cos(40pit+(3pi)/(2))]=1.25(1+sin40pit)` The FREQUENCY of energy oscillations is `v_(K)=40pi//(2PI)=20Hz`, the period is `T_(K)=0.05` s.

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In conditions of the previous problem find the frequency and the period of the variation of kinetic energy.

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