Mechanical Prop...

A metal rod of Young's modulus $$2\times { 10 }^{ 10 }N{ m }^{ -2 }$$ undergoes an elastic strain of 0.02%. The energy per unit volume stored in the rod, in $$Joules$$ is ?

A wire elongates by $$l$$ mm when a load W is hanged from it. If the wire goes over a pulley and two weights W each are hung at the two ends, the elongation of the wire will be (In mm) -

A metal wire of length $$2.5 m$$ and area of cross section $$1.5\times { 10 }^{ -6 }{ m }^{ -2 }$$, is stretched through $$2 mm$$. Calculate the work done during stretching. $$Y=1.2\times { 10 }^{ 11 }N{ m }^{ -2 }$$

A brass wire of diameter $$1 mm$$ and of length $$2 m$$ is stretched by applying a force of $$20 N$$. If the increase in length is $$0.51 mm$$. Then the Young's modulus of the wire is 

 A force of $$15 N$$ increases the length ofa by $$1 \mathrm { mm }$$. The additional force require increase the length by $$2.5 \mathrm { mm }$$ in N is 

Ball A strikes with velocity u elastically with identical ball B at rest, inclined at an angle of with line joining the centers of two balls. What will be the speed of ball B after the collision: 

A material has poisson's ratio $$0.3$$. If a uniform rod of it suffers a longitudinal strain of $$25\times 10^{-3}$$, then the percentage increase in its volume is

When a weight of $$10 \,kg$$ is suspended from a copper wire of length $$3 \,m$$ and diameter $$0.4 \,mm$$. Its length increases by $$2.4 \,cm$$. If the diameter of the wire is doubled, then the extension is its length will be :

The Young's modulus a rubber string 8 cm long and density 1.5 kg/ $$m^{3}$$ is $$5\times 10^{8}N/m^{2}$$, is suspended on the ceiling in a room. The increases in length due to its own weigth will be 

Write Copper, Steel, Glass and Rubber in order of increasing coefficient of elasticity