In order to find time, the astronaut orbiting in an earth satellite should use—
Options:
- (A) a pendulum clock
- (B) a watch having mainspring to keep it going
- (C) either a pendulum clock or a watch
- (D) neither a pendulum clock nor a watch
Correct Answer: (B) a watch having mainspring to keep it going
Explanation:
- Pendulum clocks rely on gravity to function. The swinging of the pendulum is governed by gravitational acceleration.
👉 In zero gravity or microgravity (as experienced in a satellite), a pendulum will not swing properly, so a pendulum clock won’t work. - Watches with mainsprings (mechanical watches) or quartz watches do not rely on gravity.
👉 These use mechanical energy (springs or oscillating crystals) and will function in space.
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