Angular Variables in Circular Motion

IMPORTANT

Angular Variables in Circular Motion: Overview

This topic covers concepts, such as, Linear Velocity in Circular Motion, Relation between Linear and Angular Velocity, Tangential Acceleration & Relation between Angular Acceleration and Tangential Acceleration etc.

Important Questions on Angular Variables in Circular Motion

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Two particles of mass M and m are moving in a circle of radii R and r. If their time – periods are same, what will be the ratio of their linear velocities?

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What is the linear velocity if the angular velocity vector is ω=3i^4j^+k^  and position vector is r=5i^6j^+6k^ ?

EASY
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A body is whirled in a horizontal circle of radius 20 cm. It has an angular velocity of   10 rad s .  What is its linear velocity at any point on circular path

EASY
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When a body moves with a constant speed along a circle

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Spotlight S rotates in a horizontal plane with a constant angular velocity of 0.1 rad s-1. The spot of light P moves along the wall at a distance of 3 m. The velocity of the spot P when θ=45° (see. fig.) is 

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MEDIUM
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A solid body rotates an angle θ about a stationary axis according to the law θ=6t-2t3. What is the mean value of angular velocity (in rad s-1)over the time interval between t=0 and the time when the body comes to rest?

EASY
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The angular displacement of a particle, rotating with constant angular acceleration is θ=14 t+4 t2; θ is measured in radian and t in second. The angular acceleration of the particle is,

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How much distance is covered by the tip of a minute hand of length 5 cm when it moves from 3 to 6

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Determine the angular speed of a 40 rpm turntable in rad/s.

HARD
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A rod of length L is pivoted at one end and is rotated with a uniform angular velocity, in a horizontal plane. Let T1 and T2 be the tensions at points L4 and 3L4, away from the pivoted ends.

MEDIUM
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A particle when moves in a circle with a uniform speed:

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A ring of radius R rolls without slipping on a rough horizontal surface with a constant velocity. The radius of curvature at the highest point of the path followed by any particle on the ring :

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A particle P is moving in a circle of radius ' r ' with a uniform speed v. C is the centre of the circle and AB is a diameter. When passing through B the angular velocity of P about A and C are in the ratio

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A particle is moving in a circle with constant tangential acceleration. Which one of the following is constant?

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A point moves along a circle such that distance travelled S=at2 [where a=12 m/s2] and t is time in second. Find the total acceleration of the point at the moment when it covered the nth(n=0.10) fraction of the circle after the beginning of the motion to the closest integer. [Take π2=10]

HARD
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One end of a string having length L 0.5 m attached to the a ball of mass m 0.5 kg . The ball is rotated on a horizontal circular path about vertical axis. The maximum tension that the string can bear is 324 N. If maximum value of angular velocity of ball in rads-1 is N then what is the value of N6?

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A body of mass m=10 kg is attached to one end of a wire of length 0.3 m. The maximum angular speed ( in rad s-1 ) with which it can be rotated about its other end in space station is (Breaking stress of wire =4.8×107Nm-2 and area of cross section of the wire =10-2 cm2 is :

MEDIUM
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The angle turned by a body undergoing circular motion depends on time as θ = θ 0 + θ 1 t + θ 2 t 2 , Then the angular acceleration of the body is :

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The angular speed of a car increases from 600 rpm to 1200 rpm in 10 s. What is the angular acceleration of the car?

EASY
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An object is moving around a circular path of radius R with speed of v m/s. The value of tangential acceleration in Uniform circular motion is