Value of escape velocity for the surface of the earth is 11 km/sec. Its value for surface of the moon is:
Correct answer: C. 2.4 km/sec
- A. 11 km/sec
- B. 10.4 km/sec
- C. 2.4 km/sec
- D. 4.3 km/sec
Explanation
The correct answer is Option C: 2.4 km/sec. The escape velocity for the Moon is approximately 2.374 km/sec. This is significantly lower than Earth's escape velocity due to the Moon's smaller mass and gravitational pull. Options A and B are incorrect because they refer to the escape velocities of Earth and Venus, respectively. Option D is also incorrect as it does not correspond to any known celestial body's escape velocity.
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About Satellite Motion and Orbital Velocity
Satellite motion uses gravitational force as the centripetal force required for circular orbit, giving relationships among orbital radius, period and orbital velocity. Questions cover geostationary conditions and weightlessness, while distinguishing orbital velocity, escape velocity and the satellite's tangential speed.
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