Physics Past Questions and Answers

The inside of a vacuum flak is usually coated with silver to reduce heat loss by

Dry oxygen is trapped by a pellet of mercury in a uniform capillary tube which is sealed at one end. The length of the column of oxygen at 27^oC is 50cm. if the pressure of the oxygen is constant, at what temperature will the length be 60cm?

A waterfall is 1.260m high. Calculate the change in temperature of a quantity of water that falls from the top to the bottom of the waterfall. (Neglect heat losses to the surroundings, take g as 10m^-2 and specific heat capacity of water as 4200Jkg^-1K^-1)

A piece of metal is heated until it becomes red-hot, it is then quickly transferred into a beaker containing boiling water. What effect will this have on the boiling water?

A 90-W immersion heater is used to supply energy for five minutes. The energy supplied is used to completely melt 180g of a solid at is melting point. Neglecting energy losses to the surroundings, calculate the specific latent heat of fusion of the solid