The tides raise the water in the sea roughly in a day: (Work, Power & Energy, Work Done by gravitational field)
Correct answer: B. twice
- A. once
- B. twice
- C. four times
- D. eight times
Explanation
Explanation: Tides are caused by the combined gravitational pull of the Moon and the Sun on the Earth's oceans. This pull creates two bulges on opposite sides of the Earth, resulting in high tides at two locations roughly 12 hours apart. Therefore, the water in the sea experiences high tide roughly twice a day. Incorrect Options:(a) Once: The tidal cycle involves two high tides and two low tides in a day, not just one high tide.(c) Four times: While there are four tidal events in a day (two high and two low), the question specifically asks about the frequency of high tides, which is twice a day.(d) Eight times: This is completely inaccurate and has no basis in tidal mechanics.
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About Work and Energy
Work transfers energy when a force causes displacement, while kinetic energy, gravitational potential energy and power describe motion, position and the rate of energy transfer. The work-energy theorem links net work with change in kinetic energy, and efficiency accounts for energy losses rather than treating them as energy destruction.
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