Question

A block rests on a horizontal table which is executing SHM in the horizontal plane with an amplitude 'a'. If the coefficient of friction is 'm', then the block just starts to slip when the frequency of oscillation is(a) $\frac{1}{2\pi}\sqrt{\frac{\mu g}{a}}$(b) $\sqrt{\frac{\mu g}{a}}$(c) $2\pi\sqrt{\frac{a}{\mu g}}$(d) $\sqrt{\frac{a}{\mu g}}$

Answer 1

A clock which keeps correct time at 20°C, is subjected to 40°C. If coefficient of linear expansion of the pendulum is 12 × 10⁻⁶ per °C. How much will it gain or loose in time?(a) 10.3 seconds/day(b) 20.6 seconds/day(c) 5 seconds/day(d) 20 minutes/day