Newton's Law of Gravitation

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8.1Newton's Law of Gravitation

Newton's Law of Gravitation Revision Questions

1) The orbital period of an artificial satellite revolving with engines turned off around the Moon at a distance of 1,737 km from the lunar centre is 2.0 hours. Calculate the mass of the Moon if no other factor but gravitational force between the Moon and satellite is taken into consideration.

  1. 5.974 × 1018 kg
  2. 3.985 × 1022 kg
  3. 5.974 × 1022 kg
  4. 3.985 × 1018 kg

Correct Answer: C

2) At what tangential velocity must an object at 429 km above the Earth surface move to turn into an artificial satellite? Take radius of Earth 6371 km and mass of the Earth equal to 5.972 × 1024 kg.

  1. 6.802 × 103 m/s
  2. 2.42 × 107 m/s
  3. 2.42 × 103 m/s
  4. 5.857 × 106 m/s

Correct Answer: A

3) Two satellites, one geostationary and the other geosynchronous are at the same position in a given instant. How far from each other will they be after 12 hours? Take the radius of Earth equal to 6371 km.

  1. 42157 km
  2. 84314 km
  3. 40010 km
  4. 91577 km

Correct Answer: B

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