Welcome to your Thermodynamics
In second law of thermodynamic, which of the following state that no device can transfer heat from cooler body to a warmer one without leaving an effect on the surroundings
A stress which develops within an object when it attempts to expand or contract in response to a temperature changes, but cannot, due to being held rigidly in place
A Carnot heat engine receives 500KJ of heat per cycle from a high-temperature source at 600 °C and rejects heat a low temperature sink at 40°C. Determine the thermal efficiency of this Carnot engine.
When a 2lb of brass at 212°F is dropped into 5lb of water at 35°F, the resulting temperature is 41.2°F. Find the specific heat of brass in Btu/lb-°F
It states that energy can neither be destroyed nor created; it can only change forms
Three moles of an ideal gas are compressed slowly and isothermally from a volume of 5 to 1.5 ft^3, at a temperature of 320K. How much work is done?
is a measure of the average kinetic energy per molecule in a substance. a. movement
Consider a person standing in a breezy room at 22°C. Determine the total rate of heat transfer from this person if the exposed surface area and the average outer surface temperature of the person are 1.2 m^2 and 33°C, respectively, and the convection heat transfer coefficient is 6 W/m^2.ε=0.95 and σ=5.67×10-8 W/m^4-K^4
For most solids, the coefficient of volume expansion is the coefficient of linear expansion
It is the energy emitted by the matter in the form of electromagnetic waves as a result of the changes in the electronic configurations of the atom or molecules
A process in which heat energy is transferred by the flow of fluid
How much will the length of a 1.0 km section of concrete highway change if the temperature varies from -15˚C in winter to 41˚C in summer?
It is the enthalpy change associated with the condensation of gaseous positive and negative ion into a crystal
A piston cylinder device initially contains 0.8 m^3 of air at 110kPa and 80°C. The air is now compressed to 0.2 m3 in such a way that the temperature inside the cylinder remains constant. Determine the work done during this process.
State that the thermal efficiencies of all reversible heat engines operating between the same two reservoirs are the same, and that no heat engine is more efficient than a reversible one operating between the same two reservoirs.
In order to use a substance to make a thermometer the substance must with a temperature change
is the partial pressure of water vapor at the existing temperature divided by the equilibrium vapor pressure of water at the existing temperature
Heat is transferred to a heat engine from a furnace at a rate of 92MW. If the rate of waste heat rejection to a nearby river is 45MW, determine the net power output and the thermal efficiency for this heat engine.
The volume of a given amount of water as the temperature decreases from 4˚C to 0˚C
25. A 50 kg iron block at 80°C is dropped into an insulated tank that contains 0.5 m^3 of liquid water at 25°C. Determine the temperature when thermal equilibrium reached. The specific heat of iron is 0.45kJ/kg-°C and for water is 4.18kJ/kg-°C.
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