Physics Crash Course NDA & NA EE>Chapter 6 - Work, Energy and Power>Exercise 1>Q 7

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Dimensional formula for work is:

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Important Questions on Work, Energy and Power

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Physics Crash Course NDA & NA EE>Chapter 6 - Work, Energy and Power>Exercise 1>Q 8

A block of mass

0.1 kg

slides down a rough inclined plane. If the speed of the block decreases from

10 m s^{- 1}

to

5 m s^{- 1}

, the thermal energy developed in the process is

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Physics Crash Course NDA & NA EE>Chapter 6 - Work, Energy and Power>Exercise 1>Q 9

A particle of mass '

m

' moving with a speed '

v

' strikes a stationary particle of mass '

2 m

' and sticks to it. The speed of the system after collision will be

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Physics Crash Course NDA & NA EE>Chapter 6 - Work, Energy and Power>Exercise 1>Q 10

A light and heavy body have equal kinetic energy. Which has greater momentum?

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Physics Crash Course NDA & NA EE>Chapter 6 - Work, Energy and Power>Exercise 1>Q 11

If the velocity of the body becomes double, its kinetic energy will become.

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Physics Crash Course NDA & NA EE>Chapter 6 - Work, Energy and Power>Exercise 1>Q 12

Read the passage and answer the following question.

When a particle moves in a horizontal circle with uniform speed, its kinetic energy remains the same everywhere. Now the particle moves in a vertical circle of radius $r$ .

The kinetic energy of the particle of mass m at the lowest point of the vertical circle is

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Physics Crash Course NDA & NA EE>Chapter 6 - Work, Energy and Power>Exercise 1>Q 13

A bus and car have the same momentum. If kinetic energy of the bus is

k_{1}

and kinetic energy of the car is

k_{2}

, then

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Physics Crash Course NDA & NA EE>Chapter 6 - Work, Energy and Power>Exercise 1>Q 14

A truck and a car are moving with same kinetic energy. Both are brought to rest by applying the same retarding force.

S_{1}

is the distance travelled by truck before coming to rest and

S_{2}

is the distance travelled by the car before coming to rest.

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Physics Crash Course NDA & NA EE>Chapter 6 - Work, Energy and Power>Exercise 1>Q 15

A force does maximum work on an object. The angle between the force and displacement vector is