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**1. Homework Statement**

A mass M is suspended from a spring and oscillates with a period of 0.820s. Each complete oscillation results in an amplitude reduction of a factor of 0.985 due to a small velocity dependent frictional effect. Calculate the time it takes for the total energy of the oscillator to decrease to 0.500 of its initial value.

**2. Homework Equations**

**3. The Attempt at a Solution**

Tried .985^t = .5, then t = log(.5)/log(.985) but this didn't work... any other suggestions?