Physics Past Questions and Answers

The force required to make an object of mass m, travelling with velocity v, turn in a circle of radius r is

A machine gun with a mass of 5kg fires a 50g bullet at a speed of 100 ms\(^{-1}\). The recoil speed of the machine gun is

If in a simple pendulum experiment the length of the inextensible string is increased by a factor of four, its period is increased by a factor of?

In what range of temperature is the expansion of water anomalous?

Which of the following statements about radioactivity is true?<br/>(i) Alpha particle is positively charged<br/>(ii) Beta particle is negatively charged<br/>(iii) Gamma ray is neutral<br/>(iv) Beta particle has the same mass as helium atom<br/>(v) Gamma ray is charged.