Molecular Physics | Thermodynamics Answers

The ice and steam points on a thermometer correspond to X and 80mm respectively. A temperature of 60 degree Celsius corresponds to 52mm on the thermometer. Calculate the value of X.

If the pressure in a steam boiler as shown by the gauge is 3.6 bar, what is the temperature of the steam?

18m^3 of air having a pressure of 4 bar absolute and a temperature of 90 degrees Celsius are to be compressed together with 28m^3 of air having a pressure of 3 bar absolute and a temperature of 15 degrees Celsius, in a vessel whose volume is 22m^3. What will be the pemperature of the mixture if it's pressure is 7 bar absolute?

How many kilograms of water can be evaporated at 100 degrees Celsius by the combustion of 470 litres of fuel oil whose heat of combustion is 37 MJ/Litre

A kettle contains 1.2kg of water and is supplied with energy at a rate of 2kw from the mains. Assuming the kettle is 80% effecient, how long would it take to heat the water from 20°C to the boiling point of 100°C if no energy is dissapated from the water to the environment?

Q The specific latent heat of fusion of ice is 334000 j/kg. What does this mean?
Q At 100c water has a specific latent heat of vaporization of 2260 000 j/kg. What does this mean? How much thermal energy would be needed to change 2 kg of water at 100c into steam at the same temperature? How much thermal energy would be needed to change 10 kg?
Q Explain the terms of Kinetic theory why
a) Thermal energy is needed to turn a liquid into a gas.
b) Evaporation produces cooling.

Q An electric kettle has a power rating of 2.1 kw. The kettle is filled with 1.5kg of water at a temperature of 20c. How long after the kettle is switched on will the water start to boil?

if a thermometer reads freezing point of water as 20celcius and boiling point 150celcius how much thermometer read when the actual temp is 60celcius

An astronaut has a centripetal acceleration of 2.34 x 102 m/s2. What is the velocity of the astronaut at 6.78 x 106 meters above the surface of Earth?

a mercury barometer is defective. it contains some air in the space above the mercury. when an aacurate barometer reads 770mm, the defective one reads 760mm. when the accurate barometer reads 750mm, the defective one reads 742mm.
(a) what is the length of the air column, when the aacurate barometer reads 770mm?
(b) what is the reading of the accurate barometer when the defective one reads 752mm?
assume that the temperature remains constant.

Calculate the volume of 100 ml when subjected to a pressure of 1.5 MPa