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Question

# In order to find time, the astronaut orbiting in an earth satellite should use

A
A pendulum clock
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B
A watch having main spring to keep it going
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C
Either a pendulum clock or a watch
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D
Neither a pendulum clock nor a watch
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Solution

## The correct option is B A watch having main spring to keep it goingIn a pendulum clock, the time period depends on the value of g, while in a spring watch, the time period is independent of the value of g. In an orbiting satellite, the pendulum will experience free fall and g=0. Hence, its time period will be infinite or it will not oscillate.

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