Elastic forces...

Elastic forces

Are always conservative

Are not always conservative

Are never conservative

None of these

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State whether the following statements are true or false with reasons. a. Elastic forces are always conservative. b. Elastic forces are strictly conservative only when Hooke's law is obeyed. c. When a wire is loaded beyond the elastic limit and then reloaded, the work done disappears completely as heat.

(A): In a mechanical progressive wave, energy is transferred from one point to the other. (R): In a mechanical progressive wave energy transfer takes place because of the coupling through elastic forces between neighbouring oscillating particles of the medium.

Statement-1: Elasticity restoring forces may be conservative. Statement-2: The value of strain for same stress are different while increasing the load and while decreasing the load.

Young modulus of elasticity for a gas is

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Assertion: With increase of temperature, elastic property of a substance decreases. Reason: Elasticity is due to intermolecular forces which decreases with the increase of intermolecular distance.

The force-extension graph of an elastic wire subjected to a certain force is as shown in Figure. From the graph calculate the work done in stretching the wire.

If a force is applicable to an elastic wire of the material of Poisson's ratio 0.2 there is a decrease of the cross-sectional area by 1 % . The percentage increase in its length is :

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Elasticity of a rigid body is

AAKASH INSTITUTE ENGLISH-MECHANICAL PROPERTIES OF SOLIDS-EXERCISE

Breaking stress depends on
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Which of the following is perfectly plastic?
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The length of an elastic string is Xm when the tension is 8 N, and Y m...
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When a load of 10 kg is hung from the wire, then extension of 2m is pr...
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Substances which can be elastically stretched to large value of strain...
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A force F doubles the length of wire of cross-section a The Young modu...
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Stress-strain curve for four metals are shown in figure. The maximum Y...
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Breaking stress for a material is 2 xx 10^8 N//m^2. What maximum lengt...
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Young modulus of elasticity for a gas is
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On mixing impurities, the elasticity of a material
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Elasticity of a rigid body is
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If Young modulus is three times of modulus of rigidity, then Poisson r...
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In case of bending of a beam, depression depends on Young modulus of e...
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Two metallic cylinder made of same material and radii r and 2r are joi...
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A force Fis tangentially applied on the upper face of a cube of side b...
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A rubber ball is taken to depth 1 km inside water so that its volume r...
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In case of a liquid
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Elastic forces
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When a beam is bent
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isothermal elasticity of an ideal gas is
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