https://www.chegg.com/homework-help/questions-and-answers/object-moment-inertia-47-kg-m-2-torque-8417nm-applied-angular-acceleration-object-q21266151
A force of 200 N is applied at a point 1.3 m from the axis of rotation, causing a revolving door to accelerate at
6.2 rad/s. What is the moment of inertia of the door from its axis of rotation
A. 935 kg-m2
B.1612kg-m2
C. 24.81 kg-m2
D.41.94 kg-m?
https://www.chegg.com/homework-help/questions-and-answers/10-object-moment-inertia-150-kg-m2-torque-7
2-n-m-applied-object-angular-acceleration--208--q28760708
If we increase the angular speed of the rotor, the power of it will
A)
B)
C)
D)
Decrease
Increase
First increase and then decrease
First decrease and then increase
The torque transmitted by an engine to the rotor is 180 Nm. What will be the angular speed of the rotor if the
power of the engine is 18kW?
A) 100 rad/s
B) 500 rad/s
C) 50 rad/sec
D) None of the above
120 N of force is required to open a nut using spanner of length 10 cm. If another spanner of length 6cm is
used to open the same nut, what amount of force has to be applied?
A) 130 N
B) 200 N
C) 50N
D) 450 N
https://testbook.com/objective-questions/mcq-on-torque--5eea6a1439140f30f369f0ae
https://edurev.in/course/quiz/attempt/-1_Test-Torque/e35b7fb6-7789-4865-814c-a0012c8f57d8
5. A force of 100 N is applied to the rim of a pulley wheel of diameter 200 mm. The torque is:
(a) 2 N m (b) 20 kN m (c) 10 N m (d) 20 N m
6. The work done on a shaft to turn it through 5π radians is 25π J. The torque applied to the shaft is:
(a) 0.2 N m (b) 125π 2 N m (c) 30π N m (d) 5 N m
7. A 5 kW electric motor is turning at 50 rad/s. The torque developed at this speed is:
(a) 100 N m (b) 250 N m (c) 0.01 N m (d) 0.1 N m
8. The force applied tangentially to a bar of a screw-jack at a radius of 500 mm, if the torque required is
1 kN m, is:
(a) 2 N (b) 2 kN (c) 500 N (d) 0.5 N
9. A 10 kW motor developing a torque of (200/ π ) N m is running at a speed of:
(a) (π/20) rev/s (b) 50π rev/s (c) 25 rev/s (d) (20/π ) rev/s
10. A shaft and its associated rotating parts has a moment of inertia of 50 kg m2. The angular acceleration of
the shaft to produce an accelerating torque of 5 kN m is:
(a) 10 rad/s2 (b) 250 rad/s2 (c) 0.01 rad/s2 (d) 100 rad/s2
11. A motor has an efficiency of 25% when running at 3000 rev/min. If the output torque is 10 N m, the power
input is:
(a) 4π kW (b) 0.25π kW (c) 15π kW (d) 75π kW
12. In a belt–pulley wheel system, the effective tension in the belt is 500 N and the diameter of the driver
wheel is 200 mm. If the power output from the driving motor is 5 kW, the driver pulley wheel turns at:
(a) 50 rad/s (b) 2500 rad/s (c) 100 rad/s (d) 0.1 rad/s
Ans 5. (c) 6. (d) 7. (a) 8. (b) 9. (c) 10. (d) 11. (a) 12. ©
https://s3-eu-west-1.amazonaws.com/s3-euw1-ap-pe-ws4-cws-documents.ri-prod/9780367204747/MCQs/
Quiz-15.pdf
What is the net torque acting on the merry-go-round?
a) +36 N·m
b) -36 N·m
c) +96 N·m
d) -60 N·m
e) +126 N·m
How far do we have to place the 3-N weight from the
fulcrum to balance the system?
a) 2 cm
b) 27 cm
c) 33 cm
d) 53 cm
An 80-N plank is placed on a dock as shown. The
plank is uniform in density so the center of gravity of
the plank is located at the center of the plank. A
150-N boy standing on the plank walks out slowly
from the edge of the dock. What is the torque
exerted by the weight of the plank about the pivot
point at the edge of the dock?
a) +80 N·m
b) -80 N·m
c) +160 N·m
d) -160 N·m
e) +240 N·m
f) -240 N·m
How far from the edge of the dock can the boy move
until the plank is just on the verge of tipping?
Question: A particle moving in a circular path has an
angular momentum of L. If the frequency of rotation
is halved, then it’s angular momentum becomes
𝐿
A) 2
𝐿
B) 3
𝐿
C) 4
D)𝐿
A particle of mass 2 kg is on a smooth horizontal
table and moves in a circular path of radius 0.6 m.
The height of the table from the ground is 0.8 m. If
the angular speed of the particle is 12 rad s-1, the
magnitude of its angular momentum about a point on
the ground right under the center of the circle is
A) 14.4 kg m2s-1
B) 20.16 kg m2s-1
C) 8.64 kg m2s-1
D) None of these
If the angular momentum of a particle of mass m
rotating along a circular path of radius r with uniform
speed is L, the centripetal force acting on the particle
is
2
𝐿
A)
B)
C)
D)
2
𝑚𝑟
2
𝐿
𝑚𝑟
𝐿
𝑚𝑟
2
𝐿𝑚
𝑟
A stone of mass m tied to a string of length 𝑙 is
rotating along a circular path with constant speed 𝑣.
The torque on the stone is
A) Zero
2
B)
𝑚𝑣
𝑙
C)
𝑚𝑣
𝑙
D) 𝑚𝑙𝑣
A)
B)
C)
D)
acm = 2⍺r
acm = ⍺r
acm = ⍺/r
None of these
The wide handle of screw is based upon
A) None of these
B) B) law of conservation of linear momentum
C) Newton’s second law of motion
D) Both
When a mass is rotating in a plane about a fixed
point, its angular momentum is directed along the
A) None of these
B) Line parallel to plane of rotation
C) Tangent to the orbit
D) Radius of orbit
https://www.studiestoday.com/mcq-rotational-motion-neet-physics-torque-couple-and-angular-momentum-mcq
s-set-317100.html#srcollstop
A)
B)
3𝑚𝑎
2
5𝑚𝑎
2
C) 𝑚𝑎
D) 2𝑚𝑎
A)
B)
C)
D)
2
3
1
2
5
7
7
5
𝑔𝑠𝑖𝑛θ
𝑔𝑠𝑖𝑛θ
𝑔𝑠𝑖𝑛θ
𝑔𝑠𝑖𝑛θ
A)
B)
C)
7
8
5
8
3
4
𝑚𝑔𝑟
𝑚𝑔𝑟
𝑚𝑔𝑟
D) None of these
A)
B)
C)
D)
2
𝐾
2
2
𝐾 +𝑅
2
𝑅
2
2
𝐾 +𝑅
2
2
𝐾 +𝑅
2
𝑅
2
𝐾
2
𝑅
A)
B)
C)
D)
5
7
3
5
2
7
2
5
𝑔𝑠𝑖𝑛θ
𝑔𝑠𝑖𝑛θ
𝑔𝑠𝑖𝑛θ
𝑔𝑠𝑖𝑛θ
A)
B)
C)
D)
4𝑔ℎ/3
4𝑔ℎ
2𝑔ℎ
3/4𝑔ℎ
A) 𝑡𝑎𝑛 α
5
B) 7 𝑡𝑎𝑛 α
C)
D)
2
7
2
3
𝑡𝑎𝑛 α
𝑡𝑎𝑛 α
A)
B)
𝑅1
𝑅2
𝑅2
𝑅1
𝑅
2
C) ( 𝑅1 )
2
D) 1
A)
B)
C)
D)
A)
B)
C)
D)
𝐻
ℎ
𝐻
ℎ
𝐻
ℎ
𝐻
ℎ
=5
=4
=2
=3
17
𝑚𝑔
7
5
𝑚𝑔
7
7
𝑚𝑔
5
10
𝑚𝑔
7
A)
B)
C)
D)
A)
B)
𝑚𝑔ℎ
7
𝑚𝑔ℎ
2
2𝑚𝑔ℎ
5
7𝑚𝑔ℎ
5
15
14
8
7
C)
15
14
D)
8
7
https://www.studiestoday.com/mcq-rotational-motion-neet-physics-rolling-motion-mcqs-set-317069.html
https://www.sarthaks.com/1518325/uniform-rests-rough-horizontal-table-horizontal-force-applied-normal-facespoint-direc
https://www.sarthaks.com/1518329/cylinder-radius-resting-horizontal-platform-which-parallel-plane-axis-fixed-a
long-axis
AP 2019