Gravitational Field Test

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  1. 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)
  2. The mass and weight of a body on earth are 80kg and 80N respectively. determine the mass and the weight respectively on the planet where the pull of gravity is 1/8 that on earth.
  3. What is the escape velocity of a body on the surface of the earth of radius R if the gravitational constant is G and the mass of the earth is M? (Neglect energy losses to the surroundings)
  4. 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.
  5. What is the gravitational potential due to molecule of mass m at a distance r from it?
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