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JEE Advanced · 2008 · 13 Apr 2008 · Paper 1 · Gravitation

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STATEMENT-1
An astronaut in an orbiting space station above the Earth experiences weightlessness.
and
STATEMENT-2
An object moving around the Earth under the influence of Earth's gravitational force is in a state of 'free-fall'.
  1. (A)STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is a correct explanation for STATEMENT-1✓ Correct
  2. (B)STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is NOT a correct explanation for STATEMENT-1
  3. (C)STATEMENT-1 is True, STATEMENT-2 is False
  4. (D)STATEMENT-1 is False, STATEMENT-2 is True

Answer: (A)

Solution

An astronaut in orbit experiences weightlessness because both the astronaut and the space station are in free fall toward Earth, with the gravitational force providing the centripetal acceleration for circular motion. There is no normal force from the floor, hence apparent weightlessness. STATEMENT-2 correctly explains STATEMENT-1.

JEE Advanced · 2008 · 13 Apr 2008 · Paper 1 · Single correct option

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