CBSE
Multiple Choice QuestionsMass of a planet is 10 times that of earth and radius is 2 times that of earth. If at the earth, the escape velocity of a satellite is Ves(e), then escape. velocity at the planet is :
ves(e)
5ves(e)
2 ves(e)
10 ves(e)
Two satellites S1 and S2 revolve round a planet in coplanar circular orbits in the same sense. Their periods of revolution are 1 h and 8 h respectively. The radius of the orbit of S1 is 104 km. The speed of S2 relative to S1 when they are closest, in km/h is
104
2 × 104
104
4 × 104
If the change in the value of g at a height h above the surface of the earth is the same as at a depth x below in surface, then
x = h2
x = 0.5 h
x = 2h
x = h
A satellite of mass m, revolving round a planet of mass M in a circular orbit of radius r, then orbital velocity of the satellite is
A rocket is accelerated with speed v= 2, near earth surface and then it moves upward. At far distance from the earth surface, the speed of the rocket will
be:
(2-)
A satellite is revolving round the earth in an elliptical orbit. Its speed
will be same at all points of the orbit
will be maximum when it is at maximum distance from earth
will be maximum when its distance from the earth will be minimum
goes on increasing or decreasing continuous depending upon the mass of the satellite
Radius of orbit of satellite of earth is R its kinetic energy is proportional to
R
If the radius of the earth is reduced by 1% without changing its mass. The change in g will be
2% decrease
2% increases
1% decrease
1% increases
A satellite is in a circular orbit round the earth at an altitude R above the earth's surface,where R is the radius of the earth. If g is the acceleration due to gravity on the surface of the earth the speed of the satellite is
If the height of a satellite from the earth is negligible in comparison to the radius of the earth R, the orbital velocity of the satellite is
gR
