Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • Engineering
  • 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 the earth) are 10 m/s2&nbsp

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 the earth) are 10 m/s2 and 6400 km respectively. The required energy for this work will be 6.4 x 10n joules. Then value of 'n' is: 

Option: 1

10


Option: 2

8


Option: 3

9


Option: 4

11


Answers (1)

best_answer

Energy required = \frac{GMm}{R}

g = \frac{GM}{R^2} = > |GM=gR^2|  

\therefore E = gR^2 \frac{m}{R} \Rightarrow E=mgR

E = 1000\times 10\times 6400\times 10^3

= 64\times 10^9

= 6.4\times 10^{10}

Ans - (4)

Posted by

manish painkra

View full answer

Similar Questions