Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 128

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The potential energy of a body is given by, $U = A - B x^{2}$ (where $x$ is the displacement). The magnitude of force acting on the particle is,

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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-1>Q 129

The work done by the external forces on a system (internal forces are conservative) equals the change in

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 130

The potential energy of a particle varies with

x

according to the relation

U (x) = x^{2} - 4 x

. The point

x = 2

is a point of :

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 131

The potential energy function associated with the force

\vec{F} = 4 x y \hat{i} + 2 x^{2} \hat{j}

is :

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 132

One of the forces acting on a particle is conservative then which of the following statement(s) are true about this conservative force

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 133

Potential energy v/s displacement curve for one dimensional conservative field is shown. Force at $A$ and $B$ is respectively.

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 134

A particle which is constrained to move along the x-axis, is subjected to a force in the same direction which varies with the distance $x$ of the particle from the origin as

F (x) = - k x + a x^{3}

. Here $k$ and $a$ are positive constants. For

x \geq 0

, the functional from of the potential energy

U (x)

of the particle is

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 135

A particle of charge

Q

and mass

m

travels through a potential difference

V

from rest. The final momentum of the particle is:

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-1>Q 136

An electron moving in a electric potential field

V_{1}

enters a higher electric potential field

V_{2},

, then the change in kinetic energy of the electron is proportional to:-