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Molecular Physics | Thermodynamics
8 If the volume of a gas is
500cm3
at
127o
C and 380mm of mercury, calculate the volume of this gas at s.t.p
115cm3
128.7cm3
149.2cm3
170.6cm3
9 The mechanism of heat transfer from one point to another through vibration of the molecules of the medium is called -------------
convection
conduction
radiation
diffusion
500cm3
at
127o
C and 380mm of mercury, calculate the volume of this gas at s.t.p
115cm3
128.7cm3
149.2cm3
170.6cm3
9 The mechanism of heat transfer from one point to another through vibration of the molecules of the medium is called -------------
convection
conduction
radiation
diffusion
Molecular Physics | Thermodynamics
5 Thermal expansion of a solid material depends on the following EXCEPT
the nature of the material making up the solid
the range of the temperature change
the initial dimensions of the solid
average translational motion of constituent atoms of the material
6 One of these is NOT a basic assumption of kinetic theory of ideal gases
a gas consist of a large number of molecules
the attraction between the molecules is negligible
the kinetic energy of the molecules is changing continuously
the gas molecules are in a state of continuous random motion
7 One of these is an example of thermal radiation detector
bolometer
thermometer
thermal rod
thermal glass
the nature of the material making up the solid
the range of the temperature change
the initial dimensions of the solid
average translational motion of constituent atoms of the material
6 One of these is NOT a basic assumption of kinetic theory of ideal gases
a gas consist of a large number of molecules
the attraction between the molecules is negligible
the kinetic energy of the molecules is changing continuously
the gas molecules are in a state of continuous random motion
7 One of these is an example of thermal radiation detector
bolometer
thermometer
thermal rod
thermal glass
Molecular Physics | Thermodynamics
3 Calculate the work done against external atmospheric pressure when 1 g of water changes to
1672cm3
of steam. Take the atmospheric pressure as
1.013×105Nm−2
169.3 J
342.4 J
226.2 J
143.5 J
4 An electric kettle contains 1.5 kg of water at
100oC
and powered by a 2.0 kW electric element. If the thermostat of the kettle fails to operate, approximately how long will it take for the kettle boil dry? (Take the specific latent heat of vaporization of water as
2000kJkg−1)
500s
1000s
1500s
3000s
1672cm3
of steam. Take the atmospheric pressure as
1.013×105Nm−2
169.3 J
342.4 J
226.2 J
143.5 J
4 An electric kettle contains 1.5 kg of water at
100oC
and powered by a 2.0 kW electric element. If the thermostat of the kettle fails to operate, approximately how long will it take for the kettle boil dry? (Take the specific latent heat of vaporization of water as
2000kJkg−1)
500s
1000s
1500s
3000s
Molecular Physics | Thermodynamics
Question: A small oxygen tank at a Guage pressure of 125 atm has a volume of 6.88l at 21.0 degree Celsius. If an athlete breathes oxygen from this tank at the rate of 8.50 liter per minute when measured at atmospheric pressure and the temperature remains constant at 21.0 degree Celsius how long will the tank last before it is empty
Molecular Physics | Thermodynamics
In an experiment to verify Newton's law of cooling, the temperature of hot water in a calorimeter
T/oC
is plotted against time t/min. Which of the following is true about the graph?
the graph is linear and parallel to the T-axis
the slope of the graph is positive
the slope of the graph is negative
the graph is hyperbola
T/oC
is plotted against time t/min. Which of the following is true about the graph?
the graph is linear and parallel to the T-axis
the slope of the graph is positive
the slope of the graph is negative
the graph is hyperbola
Molecular Physics | Thermodynamics
A fluid at 0.7bar occupying 0.009m3 is compressed reversibly to a pressure of 3.5bar according to a law pv^n = constant. The fluid is then heated reversibly at constant volume until the pressure is 4bar; the specific volume is then 0.5m3/kg . A reversible expansion according to a law pv^2 = constant restores the fluid to its initial state. Sketch the cycle on a p-v diagram and calculate:
I. The mass of fluid present
II. The value of n in the first process
III. The net work of the cycle
I. The mass of fluid present
II. The value of n in the first process
III. The net work of the cycle
Molecular Physics | Thermodynamics
A student walking to class on a cold day (T=0 C) finds a silver ring with an inner diameter of D=1.8 cm. The silver has a coefficient of expansion of a=18.7 x 10^-6
a) Input an expression for the rings inner diameter Dh when the student warms it up to their body temperature, Tb.
b)What is the change in diameter in mm if Tb = 37 C
a) Input an expression for the rings inner diameter Dh when the student warms it up to their body temperature, Tb.
b)What is the change in diameter in mm if Tb = 37 C
Molecular Physics | Thermodynamics
Substance A has a higher specific heat than substance B. With all other factors equal, which requires the most energy to heat equal masses of A and B to the same temperature?
Molecular Physics | Thermodynamics
What is the total mass of 31 washers if each washer has a mass 28.1 grams (g)?
Molecular Physics | Thermodynamics
1) Describe how a system containing 2 gases can be in :
a)Mechanical but not in thermal and chemical equilibrium
b)Thermal but not in mechanical or chemical equilibrium
c)Thermal and mechanical equilibrium but not in chemical equilibrium
2) On a graph of volume versus temperature draw and label lines indicating the following processes, each proceeding from the same initial state T0, V0 :
a) an isothermal expansion
b) an isothermal compression
c) an isochoric increase in temperature
a)Mechanical but not in thermal and chemical equilibrium
b)Thermal but not in mechanical or chemical equilibrium
c)Thermal and mechanical equilibrium but not in chemical equilibrium
2) On a graph of volume versus temperature draw and label lines indicating the following processes, each proceeding from the same initial state T0, V0 :
a) an isothermal expansion
b) an isothermal compression
c) an isochoric increase in temperature
