1.) How does the period of a pendulum suspended from the ceiling of an airplane change when the plane:

(a) takes off

(b) lands with constant acceleration, and

(c) cruises at high altitude with constant speed.

3.) You run with 10 mph, away from a sound source that is emitting equally in all directions. What happens to the intensity and frequency of the sound you hear (attempt a quantitative solution) ?

4.) Two emergency vehicles are behind your car on the same highway lane. All three vehicles move with the same speed, yet you barely hear the sirens. Is such scenario possible? Explain why.

5.) What happens with the fundamental frequency of an open tube when the tube is gradually submerged in water?