Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 16

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A block of mass $m$ is released on the top of a smooth inclined plane of length $x$ and inclination $θ$ as shown in figure. Horizontal surface is rough. If block comes to rest after moving a distance $d$ on the horizontal surface, then coefficient of friction between block and surface is

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Important Questions on Work, Energy and Power

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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 17

A particle is thrown with kinetic energy

k

straight up a rough inclined plane of inclination

α

and coefficient of friction

μ .

The work done against friction before the particle comes to rest is

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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 18

A rifle bullets loses

{(\frac{1}{20})}^{th}

of its velocity in passing through a plank. Assuming that the plank exerts a constant retarding force, the least number of such planks required just to stop the bullet is

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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 19

If

F = 2 x^{2} - 3 x - 2,

then select the correct statement

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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 20

When a conservative force does positive work on a body, then the

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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 21

The variation of force $F$ acting on a body moving along $x$ -axis varies with its position $(x)$ as shown in figure

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The body is in stable equilibrium state at

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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 22

A particle located in one dimensional potential field has potential energy function

U (x) = \frac{a}{x^{2}} - \frac{b}{x^{3}},

where

a

and

b

are positive constants. The position of equilibrium corresponds to

x =

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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 23

The potential energy of a particle of mass

1 kg

moving along

x

-axis given by

U (x) = [\frac{x^{2}}{2} - x] J .

If total mechanical energy of particle is

2 J,

its maximum speed is

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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 24

The potential energy of an object of mass

m

moving in

xy

plane in a conservative field is given by

U = a x + b y,

where

x

and

y

are position coordinates of the object. Find magnitude of its acceleration :-