(A) Zero
(B) maximum
(C) Minimum
(D) constant
A particle moves in a circular path of radius r. In half the period of revolution its displacement and distance covered are:
(A) 2r, πr
(B) r, πr
(C) 2r, 2πr
(D) r√2, πr
A satellite is revolving around the earth in a circular orbit with a uniform speed v. If the gravitational force suddenly disappears, the satellite will:
(A) Continue to move in the same orbit with speed v
(B) move tangentially to the orbit with speed v
(C) Move away from the earth normally to the orbit
(D) Fall down on the earth
An artificial satellite orbiting around the earth does not fall down because the attraction of the earth:
(A) Vanishes at such distances
(B) is balanced by the attraction of the moon
(C) is balanced by the centrifugal force
(D) Provides the necessary acceleration for its motion in a curved path
Which of the following statements about the motion of an earth-satellite is/are correct?
(A) The satellite is always accelerating towards the earth
(B) There is no force acting on the satellite
(C) The acceleration and the velocity of the satellite are in the same direction
(D) The satellite must fall back to the earth when its fuel is consumed
The intensity of the earth’s gravitational field is maximum at:
(A) the center of the earth
(B) the equator
(C) the poles
(D) none of these
A car moving on a horizontal road may be thrown out of the road in taking a turn:
(A) by the gravitational force
(B) due to the lack of proper centripetal force
(C) due to the rolling frictional force between the tyre and the rode
(D) by the reaction of the ground
If the distance between two masses id doubled, the gravitational attraction between them:
(A) Is doubled
(B) becomes four times
(C) Is reduced to half
(D) is reduced to a quarter