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Physics
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Two satellites of earth,  and  , are moving in
the same orbit. The mass of  is four times the
mass of  . Which one of the following statements is true ?

A
The kinetic energies of the two satellites are

equal
B
The time period of is four times that of
C
The potential energies of earth and satellite in

the two cases are equal
D
and are moving with the same speed
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A lighter body moving with a velocity collides with a heavier body at rest. Then :

A
the lighter body rebounces with twice the velocity of bigger body
B
the lighter body retraces its path with the same velocity in magnitude
C
the heavier body does not move practically
D
both (2) and (3)
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A spring is stretched up to its maximum length. The spring possesses which of the following forms of energy?

A
Kinetic energy
B
Elastic potential energy
C
Electric energy
D
Magnetic energy
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A body at maximum height possesses:

A
Kinetic energy
B
Potential energy
C
Solar energy
D
Heat energy
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A ball of mass M moving with a velocity V collides head on elastically with another of same mass but moving with a velocity v in the opposite direction. After collision,

A
the velocities are exchanged between the two balls
B
both the balls come to rest
C
both of them move at right angles to the original line of motion
D
one ball comes to rest and another ball travels back with velocity 2V
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In SI system, the unit of P.E. is :

A
erg
B
dyne-cm
C
joule
D
none of these
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