GravitationMedium
Question
The mass of a spaceship is 1000 kg. It is to be launched from the earth′s surface out into free space. The value of ′g′ and ′R′ (radius of earth) are 10 m/s2 and 6400 km respectively. The required energy for this work will be :-
Options
A.6.4 × 1010 Joules
B.6.4 × 1011 Joules
C.6.4 × 108 Joules
D.6.4 × 109 Joules
Solution
K.E. + P.E. = 0
K.E. = P.E. =
= mgR
= 103 × 10 × 64 × 105
= 6.4 × 1010 J
K.E. = P.E. =
= mgR
= 103 × 10 × 64 × 105
= 6.4 × 1010 J
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