1.

What is escape velocity? Explain. (a) What is escape velocity? (b) Derviation of escape velocity.

Answer»

SOLUTION :The velocity that is needed to go outside the Earth's gravitational force is the escape velocity. To achieve this, the initial velocity of the moving object must be greater than the escape veloc1ty of the earth.
(b) Escape velocity on a PLANET can be obtained using following formula: `v_"ESC"=sqrt((2GM)/R)`
`V_"esc"=sqrt((2xx6.67xx10^(-11)xx6xx10^24)/(6.4xx10^6))`
`=11.18 xx 10^3` m/s = 11.18 km/s
Thus, if a spacecraft is to escape the earthgravitational forec travelto the outer space, it must have minimum velocity of 11 .2 km/s


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