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A particle is moving in a circular path on the vertical plane. It is attached at one end of a string of length I whose other end is fixed. The velocity of the particle at the lowest point is $u$ . The tension in the string is $\vec{T}$ and the acceleration of the particle is $\vec{a}$ at any position. Then, $\vec{T} . \vec{a}$ is zero at the highest point if

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Important Questions on Work, Energy and Power

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-2>Q 6

A bob of mass $M$ is suspended by a massless string of length $L$ . The horizontal velocity $V$ at position $A$ is just sufficient to make it reach the point $B$ . The angle $θ$ at which the speed of the bob is half of that at $A$ , satisfies

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-2>Q 7

The work done in slowly pulling up a block of wood weighing

2 kN

for a length of

10 m

on a smooth plane inclined at an angle of

15 º

with the horizontal by a force parallel to the incline is

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-2>Q 8

Two equal masses are attached to the two ends of a spring of spring constant

k

. The masses are pulled out symmetrically to stretch the spring by a length

x

over its natural length. The work done by the spring on each mass is

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-2>Q 9

A particle is dropped from a height $h$ . A constant horizontal velocity is given to the particle. Taking $g$ to be constant everywhere, kinetic energy $E$ of the particle w. r. t. time $t$ is correctly shown in

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-2>Q 10

A body moving at

2 m s^{- 1}

can be stopped over a distance

x

. If its kinetic energy is doubled, how long will it go before coming to rest, if the retarding force remains unchanged?

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-2>Q 11

A rod of length

1 m

and mass

0.5 kg

hinged at one end is initially hanging vertically. The other end is now raised slowly until it makes an angle

60 º

with the vertical. The required work is :

(use g = 10 m s^{- 2})

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-2>Q 13

A small mass slides down an inclined plane of inclination

θ

with the horizontal. The coefficient of friction is

μ = μ_{o} x

, where $x$ is the distance through which the mass slides down and

μ_{o}

a positive constant. Then the distance covered by the mass before it stops is

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-2>Q 14

A toy car of mass $5 kg$ starts from rest and moves up a ramp under the influence of force $F$ ( $F$ is applied in the direction of velocity) plotted against displacement $x .$ The maximum height attained is given by

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Important Questions on Work, Energy and Power

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