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A body moving at $2 m s^{- 1}$ can be stopped over a distance $x$ . If its kinetic energy is doubled, how long will it go before coming to rest, if the retarding force remains unchanged?

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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-2>Q 11

A rod of length

1 m

and mass

0.5 kg

hinged at one end is initially hanging vertically. The other end is now raised slowly until it makes an angle

60 º

with the vertical. The required work is :

(use g = 10 m s^{- 2})

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-2>Q 13

A small mass slides down an inclined plane of inclination

θ

with the horizontal. The coefficient of friction is

μ = μ_{o} x

, where $x$ is the distance through which the mass slides down and

μ_{o}

a positive constant. Then the distance covered by the mass before it stops is

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-2>Q 14

A toy car of mass $5 kg$ starts from rest and moves up a ramp under the influence of force $F$ ( $F$ is applied in the direction of velocity) plotted against displacement $x .$ The maximum height attained is given by

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-2>Q 15

____________ of a two particle system depends only on the separation between the two particles.

The most appropriate choice for the blank space in the above sentence is

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-2>Q 16

A block of mass $m$ is attached to two unstretched springs of spring constants $k_{1}$ and $k_{2}$ as shown in figure. The block is displaced towards right through a distance $x$ and is released. Find the speed of the block as it passes through the mean position shown.

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-2>Q 17

A spring of spring constant

k

placed horizontally on a rough horizontal surface is compressed against a block of mass

m

placed on the surface so as to store maximum energy in the spring. If the coefficient of friction between the block and the surface is

μ,

the potential energy stored the spring is:

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-2>Q 18

A wedge of mass $M$ fitted with a spring of stiffness $' k'$ is kept on a smooth horizontal surface. A rod of mass $m$ is kept on the wedge as shown in the figure. System is in equilibrium. Assuming that all surfaces are smooth, the potential energy stored in the spring is :

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-2>Q 19

If a spring extends by

x

on loading, then energy stored by the spring is (if

T

is the tension in the spring and

k

is the spring constant)

A body moving at 2 m s-1 can be stopped over a distance x. If its kinetic energy is doubled, how long will it go before coming to rest, if the retarding force remains unchanged?

Important Questions on Work, Energy and Power

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A body moving at $2 m s^{- 1}$ can be stopped over a distance $x$ . If its kinetic energy is doubled, how long will it go before coming to rest, if the retarding force remains unchanged?