1
AIPMT 2011 Prelims
+4
-1
A body projected vertically from the earth reaches a height equal to earth's radius before returning to the earth. The power exerted by the gravitational force is greatest
A
at the highest position of the body
B
at the instant just before the body hits the earth.
C
it remains constant all through.
D
at the instant just after the body is projected.
2
AIPMT 2010 Mains
+4
-1
A particle of mass M, starting from rest, undergoes uniform acceleration. If the speed acquired in time T is V, the power delivered to the particle is
A
$${{M{V^2}} \over T}$$
B
$${1 \over 2}{{M{V^2}} \over {{T^2}}}$$
C
$${{M{V^2}} \over {{T^2}}}$$
D
$${1 \over 2}{{M{V^2}} \over T}$$
3
AIPMT 2010 Prelims
+4
-1
A ball moving with velocity 2 m/s collides head on with another stationary ball of double the mass. If the coefficient of restitution is 0.5, then their velocities (in m/s) after collision will be
A
0, 1
B
1, 1
C
1, 0.5
D
0, 2
4
AIPMT 2010 Prelims
+4
-1
An engine pumps water through a hose pipe. Water passes through the pipe and leaves it with a velocity of 2 m/s. The mass per unit length of water in the pipe is 100 kg/m. What is the power of the engine?
A
400 W
B
200 W
C
100 W
D
800 W
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