Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 7 - Circular Motion>Excercise 1>Q 3

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JEE Main

IMPORTANT

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Two particles $A$ and $B$ are moving on two concentric circles of radii $R_{1}$ and $R_{2}$ with equal angular speed $ω$ . At $t = 0$ their positions and direction of motion are shown in the figure. The relative velocity ${\vec{v}}_{A} - {\vec{v}}_{B}$ at $t = \frac{π}{2 ω}$ is given by,

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Important Questions on Circular Motion

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JEE Main

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 7 - Circular Motion>Excercise 1>Q 4

If the radius of the circular path and frequency of revolution of a particle of mass

m

are doubled, then the change in its kinetic energy will be (

E_{i}

and

E_{f}

are the initial and final kinetic energies of the particle, respectively),

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 7 - Circular Motion>Excercise 1>Q 5

A body of mass

m

is performing a UCM in a circle of radius

r

with speed

v

. The work done by the centripetal force in moving it through

{(\frac{2}{3})}^{rd}

of the circular path is,

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JEE Main

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 7 - Circular Motion>Excercise 1>Q 6

A ball uniformly moves one-fourth of a circle of radius

R

in time

T

. Let

v_{1}

and

v_{2}

be the magnitudes of mean speed and mean velocity vector. The ratio

\frac{v_{1}}{v_{2}}

will be,