Alpha Question Bank for Medical: Physics>Chapter 12 - Elasticity>Exercise-2>Q 28

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A $1 m$ long metal wire of cross sectional area $10^{- 6} m^{2}$ is fixed at one end from a rigid support and a weight $W$ is hanging at its other end. The graph shows the observed extension of length $Δ ℓ$ of the wire as a function of $W$ . Young's modulus of material of the wire in $SI$ units is

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Important Questions on Elasticity

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Alpha Question Bank for Medical: Physics>Chapter 12 - Elasticity>Exercise-2>Q 29

One end of a horizontal thick copper wire of length

2 L

and radius

2 R

is welded to an end of another horizontal thin copper wire of length

L

and radius

R

. When the arrangement is stretched by applying forces at two ends, the ratio of the elongation in the thin wire to that in the thick wire is

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Alpha Question Bank for Medical: Physics>Chapter 12 - Elasticity>Exercise-2>Q 30

A liquid has only

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Alpha Question Bank for Medical: Physics>Chapter 12 - Elasticity>Exercise-2>Q 31

The breaking stress of a wire depends upon

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Alpha Question Bank for Medical: Physics>Chapter 12 - Elasticity>Exercise-2>Q 32

The Young's modulus of a wire of length

(L)

and radius

(r)

is

Y

. If the length is reduced to

\frac{L}{2}

and radius to

\frac{R}{2^{'}}

then its Young's modulus will be

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Alpha Question Bank for Medical: Physics>Chapter 12 - Elasticity>Exercise-2>Q 33

A

5 m

aluminium wire

(Y = 7 \times 10^{10} N m^{- 2})

of diameter

3 mm

supports a

40 kg

mass. In order to have the same elongation in a copper wire

(Y = 12 \times 10^{10} N m^{- 2})

of the same length under the same weight, the diameter should be in

mm

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Alpha Question Bank for Medical: Physics>Chapter 12 - Elasticity>Exercise-2>Q 34

A wire suspended vertically from one of its ends is stretched by attaching a weight of

200 N

to the lower end. The weight stretches the wire by

1 mm

. Then the elastic energy stored in the wire is ?

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Alpha Question Bank for Medical: Physics>Chapter 12 - Elasticity>Exercise-2>Q 35

The following four wires are made of same material and same tension is applied on them. Which one will have maximum increase in length?

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Alpha Question Bank for Medical: Physics>Chapter 12 - Elasticity>Exercise-2>Q 36

A catapult's string made of rubber having cross section area

25 {mm}^{2}

and length

10 cm

. To throw a

5 gm

pabble it is stretched up to

5 cm

and released. Velocity of projected pabble is

(

Young coefficient of elasticity of rubber is

5 \times 10^{8} N m^{- 2})

: