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Medium Questions
Work Energy And Power
Physics
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A perfectly elastic ball
$p_{1}$
of mass 'm' moving with velocity v collides elastically with three exactly similar balls
$p_{2}$
,
$p_{3}$
,
$p_{4}$
lying on a smooth table. Velocities of the four balls after collision are
A
0,0,0,0
B
v,v,v,v
C
v,v,v,0
D
0,0,0,v
Medium
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A body of mass 5 kg moving with a speed of
$3ms_{−1}$
collides head on with a body of mass 3 kg moving in the opposite direction at a speed of
$2ms_{−1}$
. The first body stops after the collision. Find the final velocity of the second body.
A
$3ms_{−1}$
B
$5ms_{−1}$
C
$−9ms_{−1}$
D
$30ms_{−1}$
Medium
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A particle moves under the effect of a force
$F=Cx$
from
$x=0$
to
$x=x_{1}$
. The work done in the process is (treat
$C$
as a constant):
A
$x_{1}C_{2} $
B
$Cx_{1}$
C
$2Cx_{1} $
D
$x_{1}C $
Medium
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A rain drop of mass (1/10) gram falls vertically at constant speed under the influence of the forces of gravity and viscous drag. In falling through
100 m, the work done by gravity is
A
0.98 J
B
0.098 J
C
9.8 J
D
98 J
Medium
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A sphere of mass m moving with constant velocity u, collides with another stationary sphere of same mass. If e is the coefficient of restitution, the ratio of the final velocities of the first and second sphere is
A
$1−e1+e $
B
$1+e1−e $
C
$1−ee $
D
$e1+e $
Medium
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The change in gravitational potential energy per unit space (distance) of a body represents:
A
Mass
B
Kinetic energy
C
Linear momentum
D
Weight
Medium
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A ball of mass
$_{′}m_{′}$
moves towards a wall with a velocity
$_{′}u_{′}$
, the direction of motion making an angle
$θ$
with the surface of the wall and rebounds with the same period. The change in momentum of the ball during the collision is:
A
$2musin$
$θ$
towards the wall
B
$2musin$
$θ$
away from the wall
C
$2mucos$
$θ$
towards the wall
D
$2mucos$
$θ$
away from the wall
Medium
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A car of mass 400 kg travelling at 72 kmph crashes a truck of mass 4000 kg and travelling at 9 kmph in the same direction. The car bounces back with a speed of 18 kmph. The speed of the truck after the impact is
A
9 kmph
B
18 kmph
C
27 kmph
D
36 kmph
Medium
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A heavy steel ball of mass greater than 1 kg moving with a speed of 2m/ s collides head on with a stationary ping pong ball of mass less than 0.1 g. The collision is elastic. After the collision the ping pong ball moves approximately with a speed
A
$2m/s$
B
$4m/s$
C
$2×10_{4}m/s$
D
$2×10_{3}m/s$
Medium
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A heavier body moving with certain velocity collides head on elastically with a lighter body at rest. Then
A
smaller body continues to be in the same state of rest
B
smaller body starts to move in the same direction with same velocity as that of bigger body
C
the smaller body starts to move with twice the velocity of the bigger body in the same direction
D
the bigger body comes to rest
Medium
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