Measurement of thermal energy questions | form three Physics

a) Heat capacity is defined as ___________
b) A body of mass 10 kg is raised to a height of 4 metres above the ground. The type of energy possessed by the body is called ______ and the energy possessed by the body is _____

A piece of metal of mass 40 g absorbs 320 J of heat on warming from 30 C to 5 C. Find the specific heat capacity of the metal.

The heat energy used to break bonds between molecules during melting process and to build bonds during freezing process is called
A. heat capacity.
B. latent heat.
C. radiant energy.
D. thermal energy.

a) At sea level, boiling of water occurs at ____°C while evaporation occurs at ________ temperature.
b) Evaporation occurs at the surface of the liquid while boiling occurs _________ the liquid.
c) Two factors which can affect the melting point of ice are:___

Water of mass 3 kg is heated from 26°C to 96°C. What is the amount of heat supplied to the water?
A. 21 kJ
B. 882 kJ
C. 38 kJ
D. 400 kJ

Define:
(i) Heat Capacity
(ii) Specific Heat Capacity

A specific latent heat of fusion of a substance is defined as energy required to
A change a unit mass of the substance from solid to liquid.
B change a unit mass of a substance from solid to liquid at constant temperature.
C change the mass of a substance from solid to liquid at constant temperature.
D cause a unit temperature rise of a substance.
E cause a unit mass of water to freeze at 0°C.

(a) What is meant by the terms heat capacity and specific heat capacity? State how they are related.
(b) Explain briefly how heat losses have been prevented in a vacuum flask.
(c) A heater of 500W is used to raise the temperature of 50 kg of material of specific heat capacity of 960J/kg K, from 18°C to 38°C. Assume that all of the heat from the heater is given to the material. Calculate:
(i) heat capacity of the material
(ii) the time taken in seconds.

A lump of copper of mass 0.5 kg is placed in an oven for some time then quickly transferred to a large dry block of ice at 0°C forming 0.3kg of ice after a short period.
(i) Estimate the temperature of the oven.
(ii) Give two reasons why the estimated temperature in (i) above might be lower than the actual temperature of the oven?

(i) What is meant by specific latent heat of vaporization.
(ii) Name two factors which affect the boiling point and freezing point of water.