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Q. The 15 head of a bobble-head doll oscillates in SHM at a frequency of 4.00 Hz. The amplitude of the head's oscillations decreases to 0.50 in 4.0. What is the head's time constant?

Q. A lead ball, with an initial temperature of 25oC, is released from a height of 101.0 m. It does not bounce when it hits a hard surface. Presume all the energy of the fall goes into heating the lead. Find the temperature (in degrees C) of the ball after it hits. Data: clead = 128 J/kgoC.

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