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Class 11
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Physics
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Work, Energy and Power
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Medium Questions
Work Energy And Power
Physics
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Given
k
1
=
1
5
0
0
N
/
m
,
k
2
=
5
0
0
N
/
m
,
m
1
=
2
k
g
and
m
2
=
1
k
g
. Find potential energy stored in equilibrium: (Take
g
=
1
0
m
/
s
2
)
A
2.3 J
B
0.4 J
C
3.4 J
D
0.6 J
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
2
m
u
s
i
n
θ
towards the wall
B
2
m
u
s
i
n
θ
away from the wall
C
2
m
u
c
o
s
θ
towards the wall
D
2
m
u
c
o
s
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 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 particle moves under the effect of a force
F
=
C
x
from
x
=
0
to
x
=
x
1
. The work done in the process is (treat
C
as a constant):
A
x
1
2
C
2
B
C
x
1
2
C
2
C
x
1
2
D
x
1
2
C
Medium
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>
A body of mass 5 kg moving with a speed of
3
m
s
−
1
collides head on with a body of mass 3 kg moving in the opposite direction at a speed of
2
m
s
−
1
. The first body stops after the collision. Find the final velocity of the second body.
A
3
m
s
−
1
B
5
m
s
−
1
C
−
9
m
s
−
1
D
3
0
m
s
−
1
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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>
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
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
2
m
/
s
B
4
m
/
s
C
2
×
1
0
4
m
/
s
D
2
×
1
0
3
m
/
s
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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>