Mechanical Prop...

Ratio of transverse to axial strain is 

The modulus of elasticity is dimensionally equivalent to

A wire elongates by $$1 mm$$ when a load $$W$$ is hung from it. If the wire goes over a pulley and the two weights $$W$$, each are hung at the two ends, then the elongation of the wire will be:

An iron bar of length $$L$$, cross-section $$A$$ and Young's modulus $$Y$$ is pulled by a force $$F$$ from ends so as to produce an elongation $$l$$. Which of the following statements is correct ?

A wire of length L and radius r fixed at one end and a force F applied to the other end produces and extension $$l$$ . The extension produced in another wire of the same material of length 2Land radius 2r by a force 2 F is:

Elongation of a wire under its own weight is independent of :

Assertion (A): Stress is restoring force per unit area.
Reason (R) : Interatomic forces in solids are responsible for the property of elasticity

If stress is numerically equal to young's modulus,the elongation will be

A metal string is fixed between rigid supports. It is initially at negligible tension. Its Young's modulus is Y, density is $$\rho$$  and coefficient of linear expansion is $$\alpha$$. It is now cooled through a temperature t, transverse waves will move along it with a speed of :

Three wires A, B, C made of different materials elongated by 1.5, 2.5, 3.5 mm, under a load of 5kg. If the diameters of the wires are the same,the most elastic material is that of