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

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A chain is on a frictionless table with one fifth of its length hanging over the edge. If the chain has length $L$ and mass $M,$ the work required to be done to pull the hanging part back onto the table 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 7

A bullet of mass

20 g

leaves a riffle at an initial speed

100 m s^{- 1}

and strikes a target at the same level with speed

50 m s^{- 1} .

The amount of work done by the resistance of air will be

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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 9

Figure shows the variation of a force $F$ acting on a particle along $x$ -axis. If the particle begins at rest at $x = 0,$ what is the particle's coordinate when it again has zero speed?

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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 10

A spring of force constant

K

is first stretched by distance a from its natural length and then further by distance

b .

The work done in stretching the part

b

is

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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 11

A knife of mass

m

is at a height

x

from a large wooden block. The knife is allowed to fall freely, strikes the block and comes to rest after penetrating distance

y .

The work done by the wooden block to stop the knife is

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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 12

A man is running on horizontal road has half the kinetic energy of a boy of half of his mass. When man speeds up by

1 m s^{- 1},

then his

K E

becomes equal to

K E

of the boy, the original speed of the man is

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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 13

A particle of mass

m

starts moving from origin along

x

-axis and its velocity varies with position

(x)

as

v = k \sqrt{x} .

The work done by force acting on it during first

" t "

seconds is

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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 14

The kinetic energy $K$ of a particle moving along $x$ -axis varies with its position $(x)$ as shown in figure

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The magnitude of force acting on particle at $x = 9 m$ is

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Gamma Question Bank for Medical Physics>Chapter 6 - Work, Energy and Power>Assignment>Q 15

The rate of doing work by force acting on a particle, moving along

x

-axis depends on position

x

of particle and is equal to

2 x .

The velocity of particle is given by expression.