HEAT

The length of the alcohol column in a thermometer is 2.5cm and 17.5cm when the thermometer is dipped into a melting ice and a boiling water respectively. Find the distance between every 10°C of the scale on the thermometer.

An electric heater supplies 2.5 kW of power in the form of heat to a tank of 0.02m³ of water. How long will it take to heat the water from 25 °C to 70 °C? Assume heat losses to the surroundings to be negligible. [Density of water = 1000kg/m³; The specific heat capacity of water is 4200Jkg-1K-1]

What will be the final temperature if 50 g of water at 0 °C is added to 250 g of water at 90 °C?

How much heat energy is required to change 2 kg of ice at 0°C into water at 20°C? [Specific latent
heat of fusion of water = 334 000 J/kg; specific heat capacity of water = 4200 J/(kg K).]

How much heat must be removed by a refrigerator from 2 kg of water at 70 °C to convert it to ice
cubes at -11°C? [Specific heat capacity of water = 4200J kg-1 °C-1; Specific latent heat of fusion
of ice = 334,000 Jkg-1, specific heat capacity of ice = 2100 J/(kg K)]

An iron cylinder containing gas with pressure 200kPa when it is kept is a room of temperature 27°C.
What is the pressure of the gas when the cylinder is located outdoor where the temperature is 35°C.

A fish releases a bubble of air of volume 1cm³ at the bottom of a lake. The depth of the lake is 10m. Find the volume of the bubble when it reaches the surface of the pond. (Assume that the atmospheric pressure is equal to 10m of water)