A satellite is moving very close to a planet of density . The time period of the satellite is:
1.
2.
3.
4.
A planet is moving in an elliptical orbit. If T, V, E, and L stand, respectively, for its kinetic energy, gravitational potential energy, total energy and angular momentum about the center of the orbit, then:
1. | T is conserved |
2. | V is always positive |
3. | E is always negative |
4. | the magnitude of L is conserved but its direction changes continuously |
Magnitude of potential energy (U) and time period (T) of a satellite are related to each other as:
1.
2.
3.
4.
Weightlessness experienced while orbiting the earth in space-ship is the result of
(1) Inertia
(2) Acceleration
(3) Zero gravity
(4) Freefall towards the earth
The time period of a simple pendulum on a freely moving artificial satellite is
(1) Zero
(2) 2 sec
(3) 3 sec
(4) Infinite
The centripetal force acting on a satellite orbiting round the earth and the gravitational
force of earth acting on the satellite both equal F. The net force on the satellite is
1. Zero
2. F
3.
4. 2 F
Reason of weightlessness in a satellite is:
1. Zero gravity
2. Centre of mass
3. Zero reaction force by satellite surface
4. None
If r represents the radius of the orbit of a satellite of mass m moving around a planet of
mass M, the velocity of the satellite is given by:
1.
2.
3.
4.
A satellite which is geostationary in a particular orbit is taken to another orbit. Its
distance from the centre of earth in new orbit is 2 times that of the earlier orbit. The time
period in the second orbit is:
1. 4.8 hours
2. hours
3. 24 hours
4. hours
An astronaut orbiting the earth in a circular orbit 120 km above the surface of earth, gently drops a spoon out of space-ship. The spoon will
1. Fall vertically down to the earth
3. Move towards the moon
4. Will move along with space-ship
4. Will move in an irregular way then fall down