Relativity. Galilean Transformations. Einstein's Postulates and Newton's Laws Practice Questions

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18.1Relativity. Galilean Transformations. Einstein's Postulates and Newton's Laws

Physics Revision Questions for Relativity. Galilean Transformations. Einstein's Postulates and Newton's Laws

1. A truck is moving at 126 km/h due East and a car is travelling at 30 m/s due West. Both objects are moving at constant velocity. The initial distance between the vehicles is 1.2 km. Which is the equation of motion by which the car approaches the truck if a traffic light - which is 300 behind the truck - is chosen as origin of the inertial frame of reference? Take the West-to-East direction as positive.

  1. x(t) = 1200 - 65t [in metres]
  2. x(t) = 1500 - 65t [in metres]
  3. x(t) = 1500 - 156t [in metres]
  4. x(t) = 900 - 156t [in metres]

Correct Answer: B

2. A passenger is walking at 2m/s towards the end of a bus which is moving at 72 km/h. What is the relative velocity of the passenger to the ground if the moving direction of the bus is taken as positive?

  1. 74 km/h
  2. -70 km/h
  3. 22 m/s
  4. -18 m/s

Correct Answer: D

3. Which of the following is NOT an inertial frame of reference?

  1. The Earth
  2. The Sun
  3. A car moving at constant velocity
  4. An object falling freely

Correct Answer: D

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