IB Physics Doppler effect

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A tutorial sheet of practice questions on the Doppler effect is given below.

  1. A car moves at 20.0 m s-1 to the east. The driver blows the horn of the car. If the speed of sound in air is 340 m s-1, what is the speed of the sound waves that an observer measures if they are: (a) at rest to the west of the car, (b) at rest to the east of the car, (c) moving towards the car from the east at 20.0 m s-1.
  2. A car moves at a velocity u to the east. Sound waves of frequency f0 are made by the car. The sound waves reflect from a vertical wall and travel back to the car. What is the frequency of the sound waves received by the car? The speed of sound in air is c.

IB Physics Power

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A tutorial sheet of questions on power is given below.

  1. Is power the gradient of the work-time graph?
  2. Is work done equal to the area under the power-time graph?
  3. Is work done equal to the average power multiplied by the time taken?
  4. A particle moves in SHM of period 12.0 s and amplitude 8.0 cm. Find the average power of the resultant force acting on the mass as it moves from x = +4.0 cm to the equilibrium position.