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Class 11
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Physics
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Systems of Particles and Rotational Motion
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Medium Questions
Systems Of Particles And Rotational Motion
Physics
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BITSAT
Easy Qs
Med Qs
Hard Qs
>
A constant torque acting on a uniform circular wheel changes its angular momentum from
L
to
4
L
in
4
seconds. The torque acting on it is:
A
4
L
B
1
2
L
C
4
3
L
D
3
4
L
Medium
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>
A particle of mass
m
moves uniformly with a speed
v
along a circle of radius
r
. A and B are two points on the circle, such that the arc
A
B
subtends an angle
θ
at the center of the circle. The magnitude of change in momentum as the particle moves from
A
to
B
is given by:
A
2
m
v
s
i
n
(
2
θ
)
B
2
m
v
c
o
s
(
2
θ
)
C
z
e
r
o
D
2
m
v
t
a
n
(
2
θ
)
Medium
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>
The kinetic energy of a moving body is given by
K
=
2
v
2
,
K
being in joules and
v
in m/s. Its momentum when traveling with a velocity of
2
m
s
−
1
will be :
A
1
6
k
g
m
s
−
1
B
4
k
g
m
s
−
1
C
8
k
g
m
s
−
1
D
2
k
g
m
s
−
1
Medium
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>
A torque of
0
.
5
N
m
is required to drive a screw into a wooden frame with the help of a screw driver. If one of the two forces of couple produced by screw driver is
5
0
N
, the width of the screw driver is:
A
0
.
5
c
m
B
0
.
7
5
c
m
C
1
c
m
D
1
.
5
c
m
Medium
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>
The radius of gyration of a rotating metallic disc is independent of which of the following physical quantity.
A
Position of axis of rotation
B
Mass of disc
C
Radius of disc
D
Centre of mass of disc
Medium
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>
A wheel of radius
R
is free to rotate about its natural axis and
I
is its moment of inertia. If a tangential force
F
is applied on the wheel along its rim, then angular acceleration of wheel is:
A
I
F
R
B
I
F
R
C
R
I
F
D
F
I
R
Medium
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>
A flywheel making
1
2
0
r.p.m is acted upon by a retarding torque producing angular retardation of
π
r
a
d
/
s
2
. Time taken by it to come to rest is:
A
1
s
B
2
s
C
3
s
D
4
s
Medium
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>
A brass disc is rotating about its axis. If temperature of the disc is increased then its:
A
radius of gyration increases, but moment of inertia remains the same
B
moment of inertia increases but radius of gyration remains the same
C
radius of gyration and moment of inertia both remain the same
D
radius of gyration and moment of inertia both increases
Medium
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>
A body of mass 'M' collides against a wall with a velocity 'v' and retraces its path with the same
velocity, the change in momentum is
A
z
e
r
o
B
2
M
v
C
M
v
D
−
M
v
Medium
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>
The radius of gyration of a rotating circular ring is maximum about which of the following axis of rotation:
A
neutral axis
B
axis passing through diameter of ring
C
axis passing through tangent of ring in its plane
D
axis passing through tangent of ring perpendicular to plane of ring.
Medium
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>