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Class XI

PHYSICS

Chapter-8-GRAVITATION

WORKSHEET-3

1.
A satellite is orbiting round the earth. The centripetal force on the satellite is F.
the gravitational force of earth on the satellite is also F. The net force on the
satellite is

a. F.
b. zero.

c. 2F.

d. F/2.

2. The direction of rotation of geostationary satellites around the earth is from:

a. west to east

b. south to north

c. west to north

d. south to east

3. Two satellites of mass 4m and m respectively, orbit the earth in circular orbits of radii r
and 4r. The ratio of their orbital speeds is

a. 4:1

b. 3:1

c. 2:1

d. 1:1

4. The velocity with which a projectile must be fired so that it escapes earth’s gravitation
does not depend upon
a. mass of the earth.

b. mass of the projectile.

c. radius of the projectile orbit.

a. gravitational constant.

5.
If the K.E of a satellilte revolving in an orbit near the earth surface is doubled then

a. its orbital velocity also gets doubled.
b. its period of revolution gets doubled.

c. its orbital velocity gets reduced.