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1.
A metallic rod of length 
and cross-sectional area 
is made of a material of Young modulus 
. If the rod is elongated by an amount 
, then the work done is proportional to
and cross-sectional area is made of a material of Young modulus . If the rod is elongated by an amount , then the work done is proportional to
2.
The isothermal elasticity of a gas is equal to
3.
A material has Poisson's ratio 0.50. If a uniform rod of it suffers a longitudinal strain of 
, then the percentage change in volume is
, then the percentage change in volume is