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JAMB Physics 2016 Paper

Question : 4

Total: 48

Solution:

Concept:

Gravitational acceleration varies inversely with the square of the distance from the Earth's centre.

Explanation:

At the Earth's surface, acceleration due to gravity is

g = \frac{GM}{R^2}

For a satellite at radius

4R

, the distance from the Earth's centre is

4R

So the acceleration is

\frac{GM}{(4R)^2} = \frac{GM}{16R^2}

Since

\frac{GM}{R^2} = g

, this becomes

\frac{g}{16}

Answer:

\frac{g}{16}

Option A.

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