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  1. Calculate the escape velocity of a satellite launched from the Earth’s surface (Take g as 10ms<sup>-2</sup> and the radius of the earth as 6.4 × 10<sup>6</sup>m)
  2. A mass of the earth is 6.0 X 10<sup>24</sup>kg and that of the moon is 7.0 X 10<sup>22</sup>kg. If the distance between them is 4.0 X 10<sup>8</sup>m, calculate the force of attraction between them. (G = 6.70 × 10<sup>-11</sup>Nm<sup>2</sup>kg)
  3. What is the gravitational potential due to molecule of mass m at a distance r from it?
  4. Two spheres of masses 100kg and 90kg respectively have their centres separated by a distance of 1.0m. Calculate the magnitude of the force of attraction between them. (G = 6.70 × 10<sup>-11</sup>Nm<sup>2</sup>kg)
  5. Two objects of masses 80kg and 50kg are separated by a distance of 0.2m. If the gravitational constant is 6.6 × 10<sup>-11</sup>Nm<sup>2</sup>kg, calculate the gravitational attraction between them.
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