List of top Physics Questions on Elasticity asked in AP EAPCET

Work done in stretching a wire of length L, area A, Young's modulus Y by x is:

The work done in stretching a wire by 1 mm is 2 J. The work necessary for stretching another wire of the same material but triple the radius and one third of length by 1 mm is:

The ratio of the stress to the strain within the elastic limit is called

Two copper wires of length $L$ and $2L$ have radii $r$ and $2r$ respectively. If they are subjected to the same tension force, the ratio of their extension ($\Delta L_1 / \Delta L_2$) is:

One end of a steel rod is clamped to the roof and the other end is attached to a mass of \(1000\ \text{kg}\) as shown in the figure. The length of the rod is \(50\ \text{cm}\) and its cross-sectional area is \(1000\ \text{mm}^2\). The change in the length of the rod due to the weight of the mass is
\[ (\text{Young's modulus of steel }=2\times10^{11}\ \text{N m}^{-2}) \] \[ (\text{acceleration due to gravity }=10\ \text{m s}^{-2}) \]

A rubber band catapult has initial length \(2 \, \text{cm}\) and cross-sectional area \(5 \, \text{mm}^2\). It is stretched to \(2 \, \text{cm}\) and then released to project a stone of mass \(20 \, \text{g}\). The velocity of projected stone is \((Y=5\times 10^8\,\text{N m}^{-2})\):

Statement (A): For an ideal liquid, the bulk modulus is infinite and the shear modulus is zero.
Statement (B): The volume contraction of a metal cube of bulk modulus \(140\,\text{GPa}\), \(10\,\text{cm}\) on an edge, when subjected to a hydraulic pressure of \(7\times 10^6\,\text{Pa}\), is \(-0.05\,\text{m}^3\).
Statement (C): A spiral spring is stretched by a weight attached to it. The strain is tensile.

A copper wire of length \(2.4\,\text{m}\) and an aluminum wire of length \(0.7\,\text{m}\), both having diameter \(2\,\text{mm}\), are connected end to end. When stretched by a load, the obtained elongation is found to be \(0.6\,\text{mm}\). The applied load is \((Y_{\text{Cu}}=1.2\times10^{11}\,\text{N/m}^2,\ Y_{\text{Al}}=0.7\times10^{11}\,\text{N/m}^2)\):

Two wires \(A\) and \(B\) of same cross-section are connected end to end. When same tension is created in both wires, the elongation in \(B\) wire is twice the elongation in \(A\) wire. If \(L_A\) and \(L_B\) are the initial lengths of the wires \(A\) and \(B\) respectively, then \((\text{Young's modulus of material of wire }A=2\times 10^{11}\,\text{N m}^{-2}\text{ and Young's modulus of material of wire }B=1.1\times 10^{11}\,\text{N m}^{-2})\)