Physics
Grade-10
Easy
Question
Choose the correct statement from the following:
Assertion: An astronaut in a satellite feels weightlessness.
Reason: The gravitational force acting on the satellite is zero.
- The assertion is correct, but the reason is wrong.
- Both assertion and reason are correct, but the reason is not the correct explanation of the assertion.
- Both assertion and reason are correct, and the reason is the correct explanation of the assertion.
- The assertion is wrong, but the reason is correct.
Hint:
An astronaut in a satellite is a condition of free fall.
The correct answer is: The assertion is correct, but the reason is wrong.
The centrifugal force in the satellite frame of reference balances the gravitational force acting on the astronaut and hence, normal reaction on the astronaut is zero. Therefore, an astronaut feels weightlessness in a satellite as he feels a zero normal reaction because both the satellite and astronaut are under free fall.
Hence, both assertion and reason and correct, and reason is the correct explanation for the assertion.
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A planet in a circular orbit around the Sun moves at a constant speed. The orbit is maintained by the force of gravity between the planet and the Sun. Yet no work is done on the planet. How is it possible?
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If r represents the radius of the orbit of a planet of mass m moving around the Sun of mass M, the orbital velocity of the planet is given by:
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