Mechanical Prop...

A wire extends by 'l' on the application of load 'mg'. Then, the energy stored in it is :

The graph shows the behaviour of a steel wire in the region for which the wire obeys Hooke's law.The graph is a part of a parabola. The variables x and y might represent.

Assertion (A) : The elastic potential energy of a spring increases when it is elongated and decreases when it is compressed.
Reason (R) : Work done on spring is stored in it as elastic potential energy.

The stress required to double the length of a wire of Young's modulus $$E$$ is :

A metallic rod of length 'L' and cross-section 'A' has Young's modulus 'Y' and coefficient of linear expansion $$\alpha$$. If the rod is heated to a temperature 'T', then the energy stored per unit volume is:

A force of $$30N$$ acts on a rod of area of cross section 5 x 10$$^{-6}$$ $$m^{2}$$. The stress produced in dyne/cm$$^{2}$$ is :

Three wires A,B, C made of the same material and radius have different lengths. The graphs in the figure shows the elongation-load variation. The longest wire is:

A uniform heavy rod of length $$L$$ and area of cross-section area $$A$$ is hanging from a fixed support. If Young's modulus of the material of the rod is $$Y$$, then the increase in the length of the rod is ($$\rho$$ is a density of the material of the rod) :

A $$20 kg$$ load is suspended by a wire of cross section $$0.4 mm$$$$^{2}$$. The stress produced in N/m$$^{2}$$ is :

When an elastic material with Young's modulus $$'Y'$$ is subjected to a stretching stress $$'S'$$, then the elastic energy stored per unit volume is: