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
Create a free account to view solution
View Solution FreeMore Work, Power and Energy Questions
A ball after falling from a height of 10m strikes the roof of a lift which is descending down with a velocity of 1 m/s. ...A rod of mass m, uniform cross sectional area A and length L is accelerated by applying force F asshown in figure on a s...Two metallic plates A and B, each of area 5 × 10-4m2 are placed parallel to each other at a separation of 1 cm. Pla...Consider two process A and B on a system as shown in the figure let ᐃW1 and ᐃW2 be the work done by the syst...A heavy nucleus at rest breaks into two fragments which fly off with velocities 8 : 1. The ratio of radii of the fragmen...