Alpha Question Bank for Engineering: Physics>Chapter 7 - Circular Motion>Exercise - 1>Q 27

MEDIUM

JEE Main/Advance

IMPORTANT

Earn 100

In the figure shown a lift goes downwards with constant retardation. An observer in the lift observers a conical pendulum in the lift, revolving in a horizontal circle with time period $2$ seconds. The distance between the centre of the circle and the point of suspension is $2.0 m$ . Find the retardation of the lift in $m s^{- 2}$ . Use $π^{2} = 10$ and $g = 10 m s^{- 2}$

Important Questions on Circular Motion

EASY

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Physics>Chapter 7 - Circular Motion>Exercise - 1>Q 29

Two racing cars of masses

m_{1}

and

m_{2}

are moving in circles of radii

r

and

2 r

respectively and their angular speeds are equal. The ratio of the time taken by cars to complete one revolution is:

MEDIUM

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Physics>Chapter 7 - Circular Motion>Exercise - 1>Q 30

A particle moves along a circle of radius

(\frac{20}{π}) m

with a tangential acceleration of constant magnitude. If the speed of the particle is

80 m s^{- 1}

at the end of the second revolution after motion has begun, the tangential acceleration is:

EASY

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Physics>Chapter 7 - Circular Motion>Exercise - 1>Q 31

During the circular motion with constant speed:

EASY

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Physics>Chapter 7 - Circular Motion>Exercise - 1>Q 32

Two particles

P

and

Q

are located at distances

r_{P}

and

r_{Q}

, respectively, from the axis of a rotating disc such that

r_{P} > r_{Q}

. Then,

MEDIUM

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Physics>Chapter 7 - Circular Motion>Exercise - 1>Q 33

Let

a_{r}

and

a_{t}

represent radial and tangential acceleration. The motion of a particle may be circular if:

EASY

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Physics>Chapter 7 - Circular Motion>Exercise - 1>Q 34

A particle is going with constant speed along a uniform helical and spiral path separately as shown in figure. (in case $(a)$ , vertical acceleration of particle is negligible)

Question Image

EASY

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Physics>Chapter 7 - Circular Motion>Exercise - 1>Q 36

A stone of mass of

16 kg

is attached to a string

144 m

long and is whirled in a horizontal smooth surface. The maximum tension the string can withstand is

16 N

. The maximum speed of revolution of the stone without breaking it will be,

MEDIUM

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Physics>Chapter 7 - Circular Motion>Exercise - 1>Q 37

On a horizontal smooth surface, a mass of

2 kg

is whirled in a horizontal circle by means of a string at an initial angular speed of

5 rpm

. Keeping the radius constant, the tension in the string is doubled. The new angular speed is nearly,