Mechanics - Physics Previous Year Questions

The Young's modulus of a rope of \(10 \mathrm{~m}\) length and having diameter of \(2 \mathrm{~cm}\) is \(200 \times 10^{11} \mathrm{~dyne} / \mathrm{cm}^2\). If the elongation produced in the rope is \(1 \mathrm{~cm}\), the force applied on the rope is

The system is pushed by a force \(F\) as shown in figure. All surfaces are smooth except between \(B\) and \(C\). Friction coefficient between \(B\) and \(C\) is \(\mu\). Minimum value of \(F\) to prevent block \(B\) from downward slipping is

A ball is allowed to fall from a height of \(10 \mathrm{~m}\). If there is \(30 \%\) loss of energy due to impact, then after one impact ball will go up to.

Two different ideal diatomic gases $A$ and $B$ are initially in the same state. $A$ and $B$ are then expanded to same final volume through adiabatic and isothermal process, respectively. If $p_A, p_B$ and $T_A, T_B$ represent the final pressures and temperatures at $A$ and $B$ respectively, then

The power \((P)\) of an engine lifting a mass of \(100 \mathrm{~kg}\) upto a height of \(10 \mathrm{~m}\) in \(1 \mathrm{~min}\) is

A person is standing at some point between two parallel cliffs (not exactly at the centre). He claps, and hears two echoes: the first after \(1 \mathrm{~s}\) and the second after \(2 \mathrm{~s}\). If the speed of sound in air is \(330 \mathrm{~m} / \mathrm{s}\), the distance between the two cliffs is