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NEET • PHYSICS • SYSTEM OF PARTICLES
System of particles practice · Medium
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151
Medium
151 of 157
Understanding
+4 | -1
Very thin ring of radius R is rotated about its centre. It’s radius will
View answer and explanation
Correct option: A
Increase
Option A (Increase) is correct because when a ring rotates, the centrifugal force causes it to expand, increasing its radius.
152
Medium
152 of 157
Analyzing
+4 | -1
There are some passengers inside a stationary railway compartment. The centre of mass of the compartment itself (without the passengers) is while the centre of mass of the 'compartment plus passengers' system is If the passengers move about inside the compartment then
View answer and explanation
Correct option: C
Will move but will be stationary with respect to the ground
Option C ( Will move but will be stationary with respect to the ground) is correct because the center of mass of the entire system (compartment + passengers) remains stationary if no external force acts on the system, while the center of mass of the compartment alone can move.
153
Medium
153 of 157
Understanding
+4 | -1
A particle undergoes uniform circular motion. About which point on the plane of the circle, will the angular momentum of the particle remain conserved?
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Correct option: A
center of the circle
Option A (center of the circle) is correct because the torque about the center of the circle is zero, leading to conservation of angular momentum.
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Medium
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Application
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A scooter is going round a circular road of radius 100 m at a speed of 10 m/s. The angular speed of the scooter will be
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Correct option: B
0.1 rad/s
Option B (0.1 rad/s) is correct because angular speed is calculated by dividing linear speed by the radius of the circular path.
155
Medium
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Application
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A ring starts from rest and acquires an angular speed of in 2s. The mass of the ring is 500 gm and its radius is 20 cm. The torque on the ring is
View answer and explanation
Correct option: C
0.10 Nm
Option C (0.10 Nm) is correct because the torque is calculated using the formula , where I is the moment of inertia and is the angular acceleration.
156
Medium
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Application
+4 | -1
An isolated particle of mass m is moving in a horizontal plane (x-y), along the x-axis, at a certain height above the ground. It suddenly explodes into two fragments of masses m/4 and 3m/4. An instant later, the smaller fragment is at cm. The larger fragment at the instant is at
View answer and explanation
Correct option: A
Option A () is correct because the center of mass remains unchanged after the explosion, allowing us to calculate the position of the larger fragment.
157
Medium
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Analyzing
+4 | -1
The density of a rod is increasing from end A to B it is easier to set in rotation by
View answer and explanation
Correct option: D
Clamping the rod at B and applying a force F at A perpendicular to rod
Option D (Clamping the rod at B and applying a force F at A perpendicular to rod) is correct because it maximizes the torque due to the force applied.
Revision notes and key takeaways
Review SYSTEM OF PARTICLES in your textbook or class notes, then use this set to check your understanding.
Showing 151-157 of 157 questions