Work, Power and EnergyHard
Question
The mass of a spaceship is 1000 kg. It is to belaunched from the earth′s surface out into freespace. The value of ′g′ and ′R′ (radius of earth)are 10 m/s2 and 6400 km respectively. Therequired 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
PEi + KEi = PEf + KEf
-mgR + KEi = 0 + 0
KEi = +mgR = 1000 × 10 × 6.4 × 106
work done = 6.4 × 106 J
-mgR + KEi = 0 + 0
KEi = +mgR = 1000 × 10 × 6.4 × 106
work done = 6.4 × 106 J
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