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Molecular Physics | Thermodynamics
A nozzle is a device for increasing the velocity of a steady flowing steam of fluid.at the inlet to a certain nozzle the enthalpy of the fluid is 3052kj/kg and the velocity is 60m/s. At the exit from the nozzle the enthalpy is 2790kj/kg the nozzle is horizontal and there is negligible heat loss from it
Find the velocity at the nozzle exit
If the inlet area is 0.1m² and specific volume at inlet is 0.19m³/kg find the rate of flow of fluid
If the specific volume at the nozzle exit is 0.5m³/kg find the exit area of the nozzle
Molecular Physics | Thermodynamics
A volume of air of 20 liters is at atmospheric pressure (Patm) and a temperature of 0 ° C.
Air, which can be considered an ideal gas, undergoes the following two transformations:
Transformation 1-> 2: Isochorous compression. The air is heated until its pressure is 3Patm.
Transformation 2-> 3: Isobaric expansion. The air is heated until its temperature reaches 600 ° C.
We give for air: Molar mass M = 29 kg / Kmol, cv = 708 J / kg.K, = 1.4 and Ru = 8.32 KJ / kg.K.
(a) What is the air temperature at the end of the transformation 1-> 2?
(b) Determine the mass of air.
(c) Deduct the internal energy variation of the air for the transformation 1-> 2 (change in U12).
(d) What is the volume occupied by the air at the end of the transformation 2-> 3?
(e) Calculate the variation of the internal air energy for the transformation 2-> 3 (change in U23).
(f) Deduct the variation in energy U13.
Air, which can be considered an ideal gas, undergoes the following two transformations:
Transformation 1-> 2: Isochorous compression. The air is heated until its pressure is 3Patm.
Transformation 2-> 3: Isobaric expansion. The air is heated until its temperature reaches 600 ° C.
We give for air: Molar mass M = 29 kg / Kmol, cv = 708 J / kg.K, = 1.4 and Ru = 8.32 KJ / kg.K.
(a) What is the air temperature at the end of the transformation 1-> 2?
(b) Determine the mass of air.
(c) Deduct the internal energy variation of the air for the transformation 1-> 2 (change in U12).
(d) What is the volume occupied by the air at the end of the transformation 2-> 3?
(e) Calculate the variation of the internal air energy for the transformation 2-> 3 (change in U23).
(f) Deduct the variation in energy U13.
Molecular Physics | Thermodynamics
0.05 Kg of a certain perfect gas occupies a volume of 0.005 metre cube at a pressure of 10 bars and a temperature of 97 ° C.
Calculate
(a) The molar mass of the gas.
(b) Its final temperature in ° C, if the latter has an expansion until its pressure reaches 2.0 bars and a
final volume of 0.05 metre cube.
If this same gas has an expansion at constant pressure with a final volume of 0.08 metre cube and cp = 1.005 KJ / Kg.K,
determine now
(c) CV
(d) Q, the heat required
(e) W, work
Calculate
(a) The molar mass of the gas.
(b) Its final temperature in ° C, if the latter has an expansion until its pressure reaches 2.0 bars and a
final volume of 0.05 metre cube.
If this same gas has an expansion at constant pressure with a final volume of 0.08 metre cube and cp = 1.005 KJ / Kg.K,
determine now
(c) CV
(d) Q, the heat required
(e) W, work
Molecular Physics | Thermodynamics
Any material with an unequal number of electrons or protons could generally be termed as?
Molecular Physics | Thermodynamics
The temperature of n moles of ideal gas is increased from T to 4T through a process for which pressure P = a T^(-1) ,where 'a' is a constant. The work done by the gas is ?
Molecular Physics | Thermodynamics
The specific heat at constant pressure of 1kg fluid undergoing a MF fluid constant pressure process is given by
Cp(2.5+40÷T+20)kg/kg⁰C
Where T is in ⁰C.
The pressure during the process is maintained at 2 bar and volume changes from 1m³ to 1.8m³ and temperature changes from 50⁰C to 450⁰C. Determine
(i)Heat added
(ii)Work done
(iii)Change in internal Energy
(iv)Change in Enthalpy
Cp(2.5+40÷T+20)kg/kg⁰C
Where T is in ⁰C.
The pressure during the process is maintained at 2 bar and volume changes from 1m³ to 1.8m³ and temperature changes from 50⁰C to 450⁰C. Determine
(i)Heat added
(ii)Work done
(iii)Change in internal Energy
(iv)Change in Enthalpy
Molecular Physics | Thermodynamics
A steel block weights 39.9 N has a volume of 0.0045 m3 submerged in fresh water , decide whether the block floats or sinks in the water ? ( Hint : density of Water = 1000 kglm3)
Molecular Physics | Thermodynamics
0.05kg of CO² with MW=44,occupying a volume of 0.03m³ at 1.025bar,is compressed reversible until the pressure is 6.15bar. Calculate final temperature, the work done on the CO²,the heat flow to or form the cylinder walls
(i)when the process is according to law pV¹.⁴=constant
(ii)when the process is Isothermal
(iii)when the process takes place in a perfectly thermal insulated cylinder.
Assume CO² to be a perfect gas takes Y=1.3
(i)when the process is according to law pV¹.⁴=constant
(ii)when the process is Isothermal
(iii)when the process takes place in a perfectly thermal insulated cylinder.
Assume CO² to be a perfect gas takes Y=1.3
Molecular Physics | Thermodynamics
Calculate the area expansivity and volume expansivity of a brass of area 120m and 120m respectively that assumes a new area and volume of 130m and 130m respectively when the linear expansivity is 0.00005 through a temperature of 50 degrees Celsius
Molecular Physics | Thermodynamics
What will be the new area of 400cm square of a solid if it's temperature is raised by 10kelvin
