Question
Question: Two satellites of earth 
are 
moving in the same orbit. The mass of 
is four times the mass of 
. Which one of the following statements is true ?
A
The potential energies of earth and satellite in the two cases are equal.
B
are 
moving with the same speed.
C
The kinetic energies of the two satellites are equal.
D
The time period of 
is four times that 
Answer
are moving with the same speed.
Explanation
Solution
Both orbital speed of satellite 
and time period of revolutions of satellite,
are independent of mass of satellite. Therefore orbital speed and time period of revolutions of both the satellites are same. Hence options (2) is correct.
The kinetic energy of a satellite, 
and potential energy of a satellite, 
.
Both depend on mass of satellite, very with mass of satellite.