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Class XI

PHYSICS

Chapter-8-GRAVITATION

WORKSHEET-2

1. If the radius of the earth shrinks by 2.5%, mass remaining constant, then how would the
value of acceleration due to gravity change?
a. 10%

b. 15 %

c. 12 %

d. 5 %

2.
If the mass of earth is eighty times the mass of a planet and diameter of the planet
is one fourth that of earth, then acceleration due to gravity on the planet would be

a. 7.8 m/s
2
b. 9.8 m/s
2
c. 6.8 m/s
2
d. 2.0 m/s
2
3.
A body of mass m is taken from earth’s surface to the height equal to radius of
earth, the change in potential energy will be

a. mgRe

b. 1/2 mgRe

c. 2 mgRe

d. 1/4 mgRe
4.
Two particles of equal mass m each are
going around a circle of radius R under the
action of their mutual gravitational
attraction. The speed v of each particle is

1 2 3