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Q.

At what height from the surface of earth the. gravitation potential an the value of g are - 5.4x 107 J kg-1 and 6.0 ms-2 respectively? Take the radius of earth as 6400 km.

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a

2600 km

b

1600 km

c

1400 km

d

2000 km

answer is A.

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Detailed Solution

v=−GMR+h=−5.4×107......(1)and g=GM(R+h)2=6......(2)dividing eqns. (1) and (2)⇒5.4×107(R+h)=6R +h = 9000 km so h = 2600 km
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