Angular Displacement, Velocity and Acceleration

Angular Displacement, Velocity and Acceleration-Advanced

Dear Readers,

Compared to other sections, Physics is considered to be the most scoring section. If prepared thoroughly, Physics can help students to secure a meritorious position in the exam. These questions are very important in achieving your success in Exams after 12th.

Q1. A particle B is moving in a circle of radius a with a uniform speed u. C is the centre of the circle and AB is diameter. The angular velocity of B about A and C are in the ratio

•  1 : 1
•  1 : 2
•  2 : 1
•  4 : 1

1 : 2

Q2.  A strap is passing over a wheel of radius 30 cm. During the time the wheel moving with initial constant velocity of 2 rev/sec. comes to rest the strap covers a distance of 25 m. The deceleration of the wheel in rad/s2 is

•  0.94
•  1.2
•  2.0
•  2.5

0.94

Q3.  A particle starts rotating from rest. Its angular displacement is expressed by the following equation where is in radian and t is in seconds. The angular acceleration of the particle is

•  0.5 rad/sec2 at the end of 10 sec
•  0.3 rad/sec2 at the end of 2 sec
•  0.05 rad/sec2 at the end of 1 sec
•  Constant 0.05 rad/sec2

Constant 0.05 rad/sec2

Q4. The planes of two rigid discs are perpendicular to each other. They are rotating about their axes. If their angular velocities are 3 rad/sec and 4 rad/sec respectively, then the resultant angular velocity of the system would be

•   1 rad/sec
•  7 rad/sec
•  5 rad/sec
•   2rad/sec

5 rad/sec

Q5. A sphere is rotating about a diameter

•  The particles on the surface of the sphere do not have any linear acceleration
•  The particles on the diameter mentioned above do not have any linear acceleration
•  Different particles on the surface have different angular speeds
•   All the particles on the surface have same linear speed

The particles on the diameter mentioned above do not have any linear acceleration

Q6.  When a ceiling fan is switched on, it makes 10 rotations in the first 3 seconds. How many rotations will it make in the next 3 seconds (Assume uniform angular acceleration)

•  10
•  20
•  30
•   40

30

Q7.  When a ceiling fan is switched off, its angular velocity falls to half while it makes 36 rotations. How many more rotations will it make before coming to rest (Assume uniform angular retardation)

•  36
•  24
•  18
•   12

12