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Question

A pendulum clock which keeps correct time at the bottom of mountain losses 30 sec/day when it taken to the top of mountain. If the height of the mountain is 1.1μ km find the value of μ(Re=6400 km).

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Solution

Te=2πlg
As we know
g=g0(12hR)
Tmountain=2π  lg0(12h6400)
Consider a simple pendulum which is having time period of 2 sec
Now, 2=2πlg(I)
2+2386400=2π  lg(12h6400)(II)
On dividing both equations, we get
22+3086400=12h6400
0.9=12h6400
0.81=12h6400
2h=(64005184)
h=608 Km.

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