An intergalactic rock star bangs his drum every 1.52 s. a, Ask an Expert

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Q1. An intergalactic rock star bangs his drum every 1.52 s. A person on earth measures that time between beats is 2.10 s. How fast is the rock star moving relative to the earth?

Q2. A 6.20 g lead bullet travelling at 450 m/s is stopped by the large tree. If half the kinetic energy of bullet is transformed into internal energy and remains with the bullet even as the other half is transmitted to the tree, what is the increase in temperature of bullet?

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