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Lokesh kumar Grade: 6
        
If' ‘g' is the acceleration due to gravity on the earth's surface, the gain in the potential energy of an object of mass m raised from the surface of the earth. to a height equal to the radius ‘R’ of the earth is
 
(a) ½ mgR
(b) ½ mgR
(c) 2 mgR
(d) mgR
3 years ago

Answers : (2)

Deepak Patra
askIITians Faculty
474 Points
										

(b) At earth surface, P.E. of system is – GmM/R At a distance R from the earth’s surface, P.E. of system is – GmM/2R

? ? U = - GmM / 2R + GmM/R ; ?U = GmM /2R

Now GM/R2 = g; ? GM / R = gR ? ?U = ½ mgR
3 years ago
Raunaq Mehta
39 Points
										(b) At earth surface, P.E. of system is –GmM/R At a distance R from the earth’s surface, P.E. of system is – GmM/2R? ? U = - GmM / 2R + GmM/R ; ?U = GmM /2RNow GM/R2 = g; ?GM / R = gR ? ?U = ½ mgR
										
one year ago
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