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Question

The acceleration due to gravity on the surface of moon is 1.7 m s¯². What is the time period of a simple pendulum on the surface of moon if its time period on the surface of earth is 3.5 s ? (g on the surface of earth is 9.8 m s¯²)

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Solution

It is given that the acceleration due to gravity on the surface of Moon, g m =17 ms 2 , the acceleration due to gravity on the surface of Earth, g e =98 ms 2 and the time period of a simple pendulum on the surface of Earth, T e =35 s 1 .

The formula of time period is,

T=2π 1 g

The equation of time period on Earth is,

T e =2π 1 g e (1)

The equation of time period on Moon is,

T m =2π 1 g m (2)

Divide equation (2) by equation (1).

T m T e = g e g m

Substitute the values.

T m 35 = 98 17 T m =84s

Hence, the time period of a simple pendulum on the surface of the Moon is 84s.


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