Beta Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>BEGINNER'S BOX - 4>Q 5

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A block of mass $m$ is attached to two springs of spring constants $k_{1}$ and $k_{2}$ as shown in the figure. The block is displaced by $x$ towards the right and released. The velocity of the block when it is at $\frac{x}{2}$ will be

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Important Questions on Work, Energy and Power

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Beta Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>BEGINNER'S BOX - 4>Q 6

A pump on the ground floor of a building can pump up water to fill a tank of volume

30 m^{3}

in

15 \min

. If the tank is

40 m

above the ground, and the efficiency of the pump is

30 %

, how much electric power is consumed by the pump?

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Beta Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>BEGINNER'S BOX - 4>Q 7

An engine pumps up

100 kg

of water through a height of

10 m

in

5 s

. If the efficiency of the engine is

60 %

, find out the power of the engine (

g = 10 m s^{- 2}

).

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Beta Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise (Conceptual Questions)>Q 1

What is the mechanical advantage of single fixed pulley ?
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Beta Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise (Conceptual Questions)>Q 2

A force

\vec{F} = (2 \hat{i} - \hat{j} + 4 \hat{k}) N

displaces a particle upto

\vec{d} = (3 \hat{i} + 2 \hat{j} - \hat{k}) m

, calculate work done.

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Beta Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise (Conceptual Questions)>Q 3

A body of mass

m

is displaced from point

A (3, 1, 2)

to point

B (4, 3, 3)

under the effect of a force,

\vec{F} = (3 \hat{i} + 2 \hat{j} + 4 \hat{k}) N

. Calculate the work done by the force.

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Beta Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise (Conceptual Questions)>Q 4

A force

\vec{F} = (3 x^{2} + 2 x - 7) N

acts on a

2 kg

body as a result of which the body gets displaced from

x = 0

to

x = 5 m

. The work done by the force will be

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Beta Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise (Conceptual Questions)>Q 5

A

2 kg

mass lying on a table is displaced in the horizontal direction through

50

cm .

The work done by the normal reaction will be

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Beta Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise (Conceptual Questions)>Q 6

A body of mass

M

tied to a string is lowered at a constant acceleration of

(\frac{g}{4})

through a vertical distance

h

. The work done by the string will be......