A space ship is coming towards earth from moon at a high speed. The speed of the air ship has to be reduced. A rocket is fired to lower its speed in a certain direction. The rocket should be fired:
Correct answer: A. In the direction towards the earth
- A. In the direction towards the earth
- B. In the direction towards the moon
- C. On the right side of space ship
- D. On the left side of space ship
Explanation
A is the correct answer. Firing the rocket in the direction towards the Earth, opposite to the motion of the spacecraft, will result in a deceleration, helping to reduce its speed.
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Newton’s law of universal gravitation relates the force between masses to their masses and separation, while gravitational field strength explains weight and orbital motion. The topic covers satellite velocity and period, escape ideas, weightlessness in free fall, and artificial gravity, which differs from ordinary gravitational attraction.
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