71.
When a body moves with a constant speed along at circle – No work is done along
it
72.
A bottle of soda water is grasped by the neck and swing briskly in a vertical
circle near which portion of the bottle do the bubbles collect --- near the
neck
73.
v = u+at is related to ---It is true for any type of
motion along a straight line.
74.
If a man standing at the equator feels weightlessness then the length of one
day will be--------24hours.
75.
A projectile is thrown from the top of a tower on the surface of earth .The
trajectory which is not possible-----straight line.
76.
Acceleration due to gravity is-------it is defined as the acceleration of a
free falling body.
77.
The escape velocity of a planet of mass M and radius R is given by-----
78.
The escape velocity for earth is--------11.2 km/s.
79.
About Kepler’s first law ------planets move around sun in elliptical orbits
with sun at one of its foci.
80.
Escape velocity of rocket fired from the earth towards the moon is a velocity
to get rid of the --------- Earth’s gravitational pulls.
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