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Question

# In order to find the time, an astronaut orbiting in the 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 goingStop watch and hourglass is not used to read time, it is useful for measuring time intervals only. In a pendulum clock and an hourglass, the time period depends on the value of g. In an orbiting satellite, the pendulum will experience free fall and feel weightlessness due to which g = 0. Hence, its time period will be infinite or it will not oscillate. In a spring watch, the time period is independent of the value of g and only depends on the spring. So, in order to find the time, an astronaut orbiting in the earth satellite should use a spring watch.

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