Assertion (A): Artificial satellites are always launched from the earth in the eastward direction. Reason (R): The earth rotates from west to east and so the satellite attains the escape velocity.
✓ Correct answer: c) A is true but R is false
ExplanationA satellite is an object in space that orbits or circles around a bigger object.There are two kinds of satellites: natural (such as the moon orbiting the Earth) or artificial (such as the International Space Station orbiting the Earth).Almost every planet having at least one moon.Assertion (A) is true: Satellites are launched in the eastward direction to take advantage of the Earth’s rotational velocity, which gives the rocket an initial boost in speed.This helps the rocket reach the required escape velocity more efficiently.Reason (R) is false: While the Earth’s rotation does provide a velocity boost but it does not directly help the satellite attain escape velocity (the speed needed to break free from Earth’s gravity, approximately 11.2 km/s).Instead, the Earth’s rotation helps the satellite achieve orbital velocity (the speed needed to stay in orbit, approximately 7.8 km/s for low Earth orbit).7. DEFENCE TECHNOLOGY 134
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