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The diagrams represent the potential energy $U$ of a function of the inter-atomic distance $r$ . Which diagram corresponds to stable molecules found in nature.

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Important Questions on Work, Energy and Power

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Alpha Question Bank for Engineering: Physics>Chapter 8 - Work, Energy and Power>Exercise - 1>Q 109

For the path $P Q R$ in a conservative force field (figure), the amount of work done in carrying a body from $P$ to $Q$ and from $Q$ to $R$ are $5 J$ and $2 J$ respectively. The work done in carrying the body from $P$ to $R$ will be

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Alpha Question Bank for Engineering: Physics>Chapter 8 - Work, Energy and Power>Exercise - 1>Q 110

The potential energy for a force field

\vec{F}

is given by

U (x, y) = \sin (x + y) J

. The force acting on the particle of mass

m kg

(0, \frac{π}{4}) m

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Alpha Question Bank for Engineering: Physics>Chapter 8 - Work, Energy and Power>Exercise - 1>Q 111

A particle is taken from point

A

to point

B

under the influence of a force. Now it is taken back from

B

A

and it is observed that the work done in taking the particle from

A

B

is not equal to the work done in taking it from

B

A

. If

W_{nc}

and

W_{c}

are the works done by non-conservative forces and conservative forces present in the system respectively,

∆ U

is the change in potential energy,

∆ k

is the change in kinetic energy, then choose the incorrect option.

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Alpha Question Bank for Engineering: Physics>Chapter 8 - Work, Energy and Power>Exercise - 1>Q 112

The potential energy of a system of two particles is given by

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

, where

x

is the distance of separation and

a

b

are positive constants. The minimum potential energy of the system is

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Alpha Question Bank for Engineering: Physics>Chapter 8 - Work, Energy and Power>Exercise - 1>Q 113

Which of the following graphs is correct for kinetic energy

(E)

and potential energy

(U)

(with height

(h)

measured from the ground) for a particle thrown vertically upward from a horizontal ground?

(h < < R_{E}

and

U = 0

h = 0)

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Alpha Question Bank for Engineering: Physics>Chapter 8 - Work, Energy and Power>Exercise - 1>Q 114

The force acting on a body moving along $x$ -axis varies with the position of the particle as shown in the figure.

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The body is in stable equilibrium at

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Alpha Question Bank for Engineering: Physics>Chapter 8 - Work, Energy and Power>Exercise - 1>Q 115

The potential energy of a system is represented in the figure, the force acting on the system will be represented by

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HARD

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Alpha Question Bank for Engineering: Physics>Chapter 8 - Work, Energy and Power>Exercise - 1>Q 118

As shown in figure a body of mass $1 kg$ is shifted from $A$ to $D$ slowly on inclined planes by applying a force parallel to the inclined plane, such that the block is always in contact with the plane surfaces. Neglecting the jerk experienced at points $C$ and $B$ , total work done by the force is:

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The diagrams represent the potential energy U of a function of the inter-atomic distance r. Which diagram corresponds to stable molecules found in nature.

Important Questions on Work, Energy and Power

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The diagrams represent the potential energy $U$ of a function of the inter-atomic distance $r$ . Which diagram corresponds to stable molecules found in nature.