1. Isothermal Process
Pv=constant
VdP+PdV=0
-VdP/dV=P
Now Bulk Modulus= -VdP/dV
So Bi=P
Adiabatic Process
PVy=constant
VydP+PyVy-1dV=0
So Ba=yP
2. if A sold sphere and a hollow sphere having same material and size are heated to same temperature and allowed to cool in the same surrounding ,it has been found that hollow sphere cools faster than solid sphere
Question 1:A monoatomic gas of n moles is contained in a vertical, frictionless piston cylinder device at Temperature T. The piston has a mass of M kg with a cross-sectional area of A cm2 and the atmospheric pressure is P N/m2.
a,Determine the pressure inside.
b. what amount is heat required to raise the temperature by ?T and double the volume
Question 2:The pressure of the gas in constant volume gas thermometer are 80 cm,90cm and 100cm of mercury at the ice point,the steam point and in a heated wax bath resp.Find the temperature of the wax bath
Question 3.The heat capacity of a substance is found to be varies as temperature
C=C0(1+aT).
A sample of mass m of that substance is heated from tempertaure T1 to T2.How much heat is required
Question 4.A monotonic gas is taken through ABCDA cycle.
A->B Constant Pressure process
B->C Constant volume process
C->D Constant Pressure process
D->A Constant volume process
The PV coordinates of point A are (P,V)
The PV coordinates of point B are (P,3V)
The PV coordinates of point C are (3P,3V)
The PV coordinates of point D are (3P,V)
1 Find the total workdone in the cycle
2 find the efficiency of the cycle.
Question 5.The coefficent of linear expansion of a substance is found to be varies as temperature
?=?0(1+aT).
A rod of lenght L made of that substance is at tempertaure T1 .It is heated to temperature T2.What is the final length of rod
Posted by physics expert at 5:24 AM Friday, January 25, 2008
Question 1:A gas is contained in a vertical, frictionless piston cylinder device. The piston has a mass of 20 kg with a cross-sectional area of 20 cm2 and is pulled with a force of 100N. If the atmospheric pressure is 100 kPa, determine the pressure inside.
Question 2:A piston-cylinder device has a ring to limit the expansion stroke. Initially the mass of air is 2 kg at 500 kPa, 30° C. Heat is now transferred until the piston touches the stop, at which point the volume is twice the original volume. More heat is transferred until the pressure inside also doubles. Determine the amount of heat transfer and the final temperature.
Question 3: A piston cylinder device contains 40 kg of water at 150 kPa, 30°C. The cross-sectional area of the piston is 0.1 m2. Heat is now added causing part of the water to evaporate. When the volume reaches 0.2 m3, the piston reaches a linear spring with a spring constant of 120 kN/m. More heat is added until the piston rises another 25 cm. Determine the final pressure, temperature and the energy transfers.
Question 4:Is the energy of the system U an intensive or extensive variable?
Question 5:Suppose we have M+N systems prepared, and the first is in thermal equilibrium with the second, the second in thermal equilibrium with the third, etc., until system M+N- 1 is in thermal equilibrium with the M+Nth system. Is the first system in thermal equilibrium with the M+Nth?
Question 6:A gas is contained in a cylinder with a moveable piston on which a heavy block is placed. Suppose the region outside the chamber is evacuated and the total mass of the block and the movable piston is 102 kg. When 2140 J of heat flows into the gas, the internal energy of the gas increases by 1580 J. What is the distance s through which the piston rises?
Question 7:A resistance thermometer is such that resistance varies with temperature as
RT=R0(1+aT+bT5)
where T represent Temperature on Celsius scale And a,b,R0 are constants.R0 unit is ohm
Based on above data ,Find out the unit of a,b
Posted by physics expert at 3:29 AM Friday, January 18, 2008
Question
A circular hole of diameter 2.00 cm is made in an aluminium plate at 0 ° C .what will be the diameter at 100° C?
? for aluminium = 2.3 * 10-3 / ° C
it's source.
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