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?
On the earth, a stone is thrown from a height in a direction parallel to the
earth’s surface while another stone is simultaneously dropped from the
same height. Which stone would reach the ground first and why?
What is the source of centripetal force that a planet requires to revolve around the Sun? On what factors does that force depend?
A girl stands on a box having 60 cm length, 40 cm breadth and 20 cm
width in three ways. In which of the following cases, pressure exerted by
the brick will be
(a) maximum when length and breadth form the base
(b) maximum when breadth and width form the base
(c) maximum when width and length form the base
(d) the same in all the above three cases
An object weighs 10 N in air. When immersed fully in water, it weighs only 8 N. The weight of the liquid displaced by the object will be
(a) 2 N
(b) 8 N
(c) 10 N
(d) 12 N
The force of attraction between two unit point masses separated by a unit
distance is called
(a) gravitational potential
(b) acceleration due to gravity
(c) gravitational field
(d) universal gravitational constant
The atmosphere is held to the earth by
(a) gravity
(b) wind
(c) clouds
(d) earth’s magnetic field
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