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Q1. An object is hung from a spring, set into vertical vibration, and immersed in a beaker of oil. Its motion is graphed. The object has mass 375 g, the spring has force constant 100 N/m, and the damping coefficient is b = 0.100 N•s/m.

(a) How long does it take for amplitude to drop to half its initial value?

(b) How long does it take for mechanical energy to drop to half its initial value?

Q2. Evaluate yourself sprinting at 7.0 m/s with a 63-g bullet travelling at 150 m/s.

a) Which has a larger momentum?

b) Which has more energy?

c) Which is more dangerous? Why?

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