A car is accelerated on a levelled road and attains a velocity 4 times of its
initial velocity. In this process the potential energy of the car
(a) does not change
(b) becomes twice to that of initial
(c) becomes 4 times that of initial
(d) becomes 16 times that of initial
When a body falls freely towards the earth, then its total energy
(a) increases
(b) decreases
(c) remains constant
(d) first increases and then decreases
How does the force of attraction between the two bodies depend upon their
masses and distance between them? A student thought that two bricks
tied together would fall faster than a single one under the action of gravity.
Do you agree with his hypothesis or not? Comment.
How does the weight of an object vary with respect to mass and radius of
the earth. In a hypothetical case, if the diameter of the earth becomes half
of its present value and its mass becomes four times of its present value,
then how would the weight of any object on the surface of the earth be
affected?
The earth is acted upon by gravitation of Sun, even though it does not fall into the Sun. Why?
The weight of any person on the moon is about 1/6 times that on the
earth. He can lift a mass of 15 kg on the earth. What will be the maximum
mass, which can be lifted by the same force applied by the person on the
moon?
Identical packets are dropped from two aeroplanes, one above the equator
and the other above the north pole, both at height h. Assuming all conditions
are identical, will those packets take same time to reach the surface of
earth. Justify your answer.
Suppose gravity of earth suddenly becomes zero, then in which direction
will the moon begin to move if no other celestial body affects it?
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