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6) A piece of iron rests on top of a piece of wood floating in a bathtub. If the iron is removed from the wood, what happens to the water level in the tub? A) It goes down. B) It goes up. C) It does not change. D) impossible to determine from the information given 7) A 2.00-kg mass oscillates on the end of a spring with spring constant 12.0 N/m. Its amplitude of oscillation decreases from 10.0 cm to 1.0 cm in 4.00 minutes. What is the linear damping coefficient of this oscillator? A) 1.76 N-s/m B) 0.622 N s/m C) 134 N-s/m D) 0.311 N s/m E) 0.0384 N-s/m 8) Two horizontal pipes are the same length, but pipe B has twice the diameter of pipe A. Water undergoes viscous flow in both pipes, subject to the same pressure difference across the lengths of the pipes. If the flow rate in pipe A is Q, what is the flow rate in pipe B? A) 16Q B) 2Q C) 4Q D) 8Q 9) When the length of a simple pendulum is tripled, the time for one complete vibration increases by a factor of A) 9. B) 3. C) 1/9. E)√√3. D) 1/3.