Physics Past Questions and Answers

A man of mass \(50 kg\) ascender a flight of stairs \(5 m\) high in 5 seconds.
If acceleration due to gravity is \(10 m / s ^{2}\) :

A body rolls down alstope from a height of \(100 m\). its velocity at the foot of the slope is \(20 m / s\).
what percentage o it essential potential energy is converted into kinetic energy ____________

Astaresult of air at the top of a barometer the height of the mercury column is \(73.5 cm\) when it should be \(75.0 cm\) the velume of the space above the mereury is \(8.0 cm ^{3}\).
Calculate the correct barometrie height when the barometer reads 74.cm and the volume of the space above the mercury is \(6.0 cm ^{3}\)

22,000J of heat is required to raise the temperature of \(1.5 kg\) of paraffin from \(20^{\circ} C\) to \(30^{\circ} C\).
Calculate the specific heat capacity of paraffin:

An object is placed \(30 cm\) from a concave mirror of focal length \(15 cm\).
the linear magnification of the image produce is ____________