GK
BASIC GENERAL KNOWLEDGE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Moon’s gravitational pull
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Centripetal force due to the earth’s rotation
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Pressure of the atmosphere
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Earth’s gravitational pull
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Detailed explanation-1: -Escape velocity is the minimum speed needed for an object to “break free” from the gravitational attraction of a massive body. The escape velocity from Earth is about 40, 270 km/h (25, 020 mph).
Detailed explanation-2: -At Earth’s surface, if atmospheric resistance could be disregarded, escape velocity would be about 11.2 km (6.96 miles) per second. The velocity of escape from the less massive Moon is about 2.4 km (1.5 miles) per second at its surface.
Detailed explanation-3: -A spacecraft leaving the surface of Earth, for example, needs to be going about 11 kilometers (7 miles) per second, or over 40, 000 kilometers per hour (25, 000 miles per hour), to enter orbit. Achieving escape velocity is one of the biggest challenges facing space travel.