Chapter 22 of 2363 min read
Newton's law of gravitation, g and its variation
Why this is asked: g falls off in both directions from the surface but not symmetrically: it drops as g(1−2h/R) with altitude, roughly twice as fast per unit distance as g(1−d/R) with depth, and reaches zero only at the centre.
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- •A body weighs 48 N on the surface of the earth. The gravitational force experienced by the body due to the earth at a height equal to one-third the radius of the earth from its surface is:
- •The mass of a planet is th that of the earth and its diameter is half that of the earth. The acceleration due to gravity on that planet is:
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