McqMate
Q. |
What is the minimum escape velocity of rocket to be launched into space? |
A. | 5 Km/Sec. |
B. | 6 Km/Sec. |
C. | 11 Km/Sec. |
D. | 15 Km/Sec. |
Answer» C. 11 Km/Sec. | |
Explanation: On the surface of the Earth, the escape velocity is about 11.2 kilometers per second 06.96 mi/s), which is approximately 34 times the speed of sound (Mach 34) and several times the muzzle velocity of a rifle bullet (up tob 1.7 km/s). However, at 9,000 km altitude in "space", it is slightly less than 7.1 km/s. In physics, escape velocity is the speed at which the kinetic energy plus the gravitational potential energy of an object is zero. |
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