Question

20. i. DERIVE THE EXPRESSION OF "g” ??
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Answer 1

Answer:

Density = mass/volume

Then, ρ = M/[4/3 πR3]

⇒ M = ρ × [4/3 πR3]

We know that, g = GM/R2.

On substituting the values of M we get,

g = 4/3 [πρRG]

At any distance ‘r’ from the centre of the earth

g = 4/3 [πρRG