Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 6 - Work, Energy and Power>Exercise>Q 4

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A body in equilibrium does not have

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Important Questions on Work, Energy and Power

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Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 6 - Work, Energy and Power>Exercise>Q 5

A particle located in a one-dimensional potential field has its potential energy function as

U (x) = \frac{a}{x^{4}} - \frac{b}{x^{2}},

where

a

and

b

are positive constants. The position of equilibrium

x

corresponds to

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Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 6 - Work, Energy and Power>Exercise>Q 6

A particle of mass

m

is moving in a horizontal circle of radius

r

under a centripetal force equal to

\frac{- K}{r^{2}}

, where

K

is a constant. The total energy of the particle is,

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Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 6 - Work, Energy and Power>Exercise>Q 7

The potential energy of a particle varies with distance $x$ as shown in the graph.

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The force acting on the particle is zero at

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Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 6 - Work, Energy and Power>Exercise>Q 8

A particle in a certain conservative force field has a potential energy given by

V = \frac{20 x y}{z} .

The force exerted on it is

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Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 6 - Work, Energy and Power>Exercise>Q 9

The negative of the work done by the conservative internal forces on a system equals the changes in

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Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 6 - Work, Energy and Power>Exercise>Q 10

If the potential energy between two molecules is given by

U = \frac{A}{r^{6}} - \frac{B}{r^{12}},

then at equilibrium, separation between molecules, and the potential energy are:

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Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 6 - Work, Energy and Power>Exercise>Q 1

A simple pendulum of length

L

swings in a vertical plane. The tension of the string when it makes an angle

θ

with the vertical and the bob of mass

m

moves with a speed

v

is (

g

is the gravitational acceleration)

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Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 6 - Work, Energy and Power>Exercise>Q 2

The string of a pendulum of length

l

is displaced through

90 °

from the vertical and released. Then the minimum strength of the string in order to withstand the tension as the pendulum passes through the mean position is: