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Lokesh kumar Grade: 6
        
Energy required to move a body of mass m from an orbit of radius 2R to 3R is
(a) GMm/12R2
(b) GMm/3R2
(c) GMm/8R
(d) GMm/6R
3 years ago

Answers : (2)

Deepak Patra
askIITians Faculty
474 Points
										

(d) Energy required = (Potential energy of the Earth – mass system when mass is at distance 3R) – (Potential energy of the Earth-mass system when mass is at distance 2R)

= - GM/3R – (-GM/2R) = - GM/3R + GM/2R

= -2GMm+3GMm / 6R = GMm/6R
3 years ago
Mallikarjun
11 Points
										Potential energy U=-GMm/rTo get energy required to move a body of mass m from 2R to 3R we have to subtract the energy required to move the body from earth to 2R, from the energy required to move the body from earth to 3RHence U=-GMm/3R -(-GMm/2R) =GMm6R
										
4 months ago
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