If a satellite of mass 400 ,kg revolves around earth in an orbit with speed 200 ,m / s then its pote

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7.Gravitation

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If a satellite of mass $400 \,kg$ revolves around the earth in an orbit with speed $200 \,m / s$ then its potential energy is .......... $MJ$

A

$-1.2$

B

$-8.0$

C

$-16$

D

$-2.4$

Solution

(c)

$PE =-2 KE$

$\quad=-2 \times 1 / 2 \times MV ^2$

given,

mass is $400\,kg , V =200\,m / s$

on substituting we get $PE =-400 \times 200 \times 200$

$=-16 \times 10^6\,J =-16$ megajoules $=-16\,MJ$

Standard 11

Physics

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