PHYSICS For Joint Entrance Examination JEE (Advanced) Mechanics I>Chapter 8 - Work, Energy and Power>Exercises>Q 74

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In the figure shown, initially, spring is in an unstretched state and blocks are at rest. Now $100 N$ force is applied on block $A$ and $B$ as shown in the figure. After some time velocity of $A$ becomes $2 m s^{- 1}$ and that of $B$ $4 m s^{- 1}$ and block $A$ displaced by amount $10 cm$ and spring is stretched by amount $30 cm$ . Then work done by spring force on $A$ will be:

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Important Questions on Work, Energy and Power

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PHYSICS For Joint Entrance Examination JEE (Advanced) Mechanics I>Chapter 8 - Work, Energy and Power>Exercises>Q 75

In the figure shown, a spring of spring constant

K

is fixed at one end and the other end is attached to the mass

' m'

. The coefficient of friction between the block and the inclined plane is

' μ'

. The block is released when the spring is in its natural length. Assuming that tan

θ > μ

, the maximum speed of the block during the motion is
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PHYSICS For Joint Entrance Examination JEE (Advanced) Mechanics I>Chapter 8 - Work, Energy and Power>Exercises>Q 1

Choose the correct statement(s) from the following.

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PHYSICS For Joint Entrance Examination JEE (Advanced) Mechanics I>Chapter 8 - Work, Energy and Power>Exercises>Q 2

Mark the correct statement(s).

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PHYSICS For Joint Entrance Examination JEE (Advanced) Mechanics I>Chapter 8 - Work, Energy and Power>Exercises>Q 3

Mark the correct statement(s).

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PHYSICS For Joint Entrance Examination JEE (Advanced) Mechanics I>Chapter 8 - Work, Energy and Power>Exercises>Q 4

Select the correct option(s).

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PHYSICS For Joint Entrance Examination JEE (Advanced) Mechanics I>Chapter 8 - Work, Energy and Power>Exercises>Q 5

A block hangs freely from the end of a spring. A boy then slowly pushes the block upwards so that the spring becomes strain free. The gain in gravitational potential energy of the block during this process is not equal to

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PHYSICS For Joint Entrance Examination JEE (Advanced) Mechanics I>Chapter 8 - Work, Energy and Power>Exercises>Q 6

In which of the following case(s) no work is done by the force?

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PHYSICS For Joint Entrance Examination JEE (Advanced) Mechanics I>Chapter 8 - Work, Energy and Power>Exercises>Q 7

A particle is taken from point

A

to point

B

under the influence of a force field. Now it is taken back from

B

to

A

and it is observed that the work done in taking the particle from

A

to

B

is not equal to the work done in taking it from

B

to

A

. If

W_{n c}

and

W_{c}

are the work done by non-conservative and conservative forces present in the system, respectively,

∆ U

is the change in potential energy and

∆ K

is the change in kinetic energy, then