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A wire is elongated by $2 mm$ when a brick is suspended from it. When the brick is immersed in water, the wire contracts by $0.6 mm$ . What is the density of brick?

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Important Questions on Elasticity

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 12 - Elasticity>Objective Problems>Q 21

A load suspended by a massless spring produces an extension of

x cm

in equilibrium. When it is cut into two unequal parts, the same load produces an extension of

7.5 cm

when suspended by the larger part of length

60 cm

. When it is suspended by the smaller part, the extension is

5.0 cm

. Then,

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 12 - Elasticity>Objective Problems>Q 22

A copper wire

(Y = 10^{11} N m^{- 2})

of length

8 m

and a steel wire

(Y = 2 \times 10^{11} N m^{- 2})

of length

4 m

, each of

0.5 {cm}^{2}

cross-section is fastened end to end and stretched with a tension of

500 N

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 12 - Elasticity>Objective Problems>Q 23

A uniform cylinder rod of length $L$ , cross-sectional area $A$ and Young's modulus $Y$ is acted upon by the forces shown in the figure. The elongation of the rod is

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 12 - Elasticity>Objective Problems>Q 24

A stress of

10^{6} N m^{- 2}

is required for breaking material. If the density of the material is

3 \times 10^{3} kg m^{- 3},

then what should be the length of the wire made of this material so that it breaks under its own weight?

HARD

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IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 12 - Elasticity>Objective Problems>Q 25

Uniform pressure

p

is exerted on all sides of a solid cube at temperature

t ° C

. By what amount should the temperature be raised in order to bring the volume back to that it had been before the pressure was applied?
(Linear expansivity of the material of the cube is

α

and the bulk modulus of elasticity is

β

)

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 12 - Elasticity>Objective Problems>Q 26

The length of an iron wire is

L

and area of cross-section is

A

. The increase in length is

l

on applying the force

F

on its two ends. Which of the statements is correct?

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 12 - Elasticity>Objective Problems>Q 27

The temperature of a wire of length

1 m

and area of cross-section

1 {cm}^{2}

is increased from

0 ° C

100 ° C

. If the rod is not allowed to increase in length, the force required will be (

α = 10^{- 5} ° C^{- 1}

and

Y = 10^{11} N m^{- 2}

)

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 12 - Elasticity>Objective Problems>Q 28

Two wires of copper having the length in the ratio

4 : 1

and their radii ratio as

1 : 4

are stretched by the same force. The ratio of longitudinal strain in the two will be

A wire is elongated by 2 mm when a brick is suspended from it. When the brick is immersed in water, the wire contracts by 0.6 mm. What is the density of brick?

Important Questions on Elasticity

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A wire is elongated by $2 mm$ when a brick is suspended from it. When the brick is immersed in water, the wire contracts by $0.6 mm$ . What is the density of brick?