Question

Plz answer with explanation...

Answer 1

First we need to find the force of gravity from a distance R (R is the height from the center to the earth to the surface) + R (height from the surface to the pendulum, as given in the question) = 2R. The answer is (g/4), as explained here: https://www.quora.com/What-is-the-value-of-acceleration-due-to-gravity-g-at-a-distance-of-2R-from-the-surface-of-earth-where-R-is-the-radius-of-the-earth

Now, given the formula T = 2pi * sqrt (L/g) , we can find T2/T1 as:

T2/T1 = [2pi * sqrt (L/(g/4)] / [2pi * sqrt (L/g)] = [2*sqrt (L/g)] / [sqrt (L/g)] = 2