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Molecular Physics | Thermodynamics
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.
Molecular Physics | Thermodynamics
If the pressure in a steam boiler as shown by the gauge is 3.6 bar, what is the temperature of the steam?
Molecular Physics | Thermodynamics
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?
Molecular Physics | Thermodynamics
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
Molecular Physics | Thermodynamics
A lady leans over a window ledge to put wet clothes out to dry. How should she arrange the clothes to make it easier for her ?
Molecular Physics | Thermodynamics
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?
Molecular Physics | Thermodynamics
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?
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?
Molecular Physics | Thermodynamics
if a thermometer reads freezing point of water as 20celcius and boiling point 150celcius how much thermometer read when the actual temp is 60celcius
Molecular Physics | Thermodynamics
Hello,
I have a carburetor, and I would like to re-jet it depending on air density changes, which I am able to calculate correctly from pressure, temperature and relative humidity data.
Now comes the doubt, and hence the question: if, to make an example, the air density increases by 10%, should I change the section of the jets to allow 10% more of flow (i.e. increase the diameter by the square root of 1.10, so go from e.g. a main jet with 1.50mm of diameter to one of 1.57) or the carburetor partly self-compensates for the air density changes, and the correction ratio should thus be lower, and not directly proportional to the ratio of the 2 air densities?
It all comes down to the Venturi effect, but I'm not a physicist hence I'm asking your help.
Thank you very much for your help.
Marco
I have a carburetor, and I would like to re-jet it depending on air density changes, which I am able to calculate correctly from pressure, temperature and relative humidity data.
Now comes the doubt, and hence the question: if, to make an example, the air density increases by 10%, should I change the section of the jets to allow 10% more of flow (i.e. increase the diameter by the square root of 1.10, so go from e.g. a main jet with 1.50mm of diameter to one of 1.57) or the carburetor partly self-compensates for the air density changes, and the correction ratio should thus be lower, and not directly proportional to the ratio of the 2 air densities?
It all comes down to the Venturi effect, but I'm not a physicist hence I'm asking your help.
Thank you very much for your help.
Marco
Molecular Physics | Thermodynamics
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?
