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1a Determine the possible number of macroscopic states for 15 molecules in two intersecting cells of equal volume.
b.detrmine the possible number of microscopic states.
c,determine the possible number of microscopic states for 8 molecules in cell A and 7 molecules in cell B.
The temperature in a refrigerator coil is 267K and that in the condenser coil is 295K. Assuming that the machine operates on the reversed Carnot cycle, calculate :
(i) C.O.P.(ref.)
(ii) The refrigerating effect per kW of input work.
(iii) The heat rejected to the condenser.
the hot water tap of a bath delivers water at b5°c at a rate of 8kg/min. the cold water tap of the bath delivers water at 30°c at the rate of 20 kg/min. if both taps are left on for 5 minutes, calculate the final temperature of the bath water, ignoring heat losses to the surroundings
. An airplane is flying at 800 km/h at an altitude where the
pressure is 46.57 kPa and the temperature is -24.6°C. The airplane is powered
by a jet engine having a maximum cycle pressure of 280 kPa and a maximum
cycle temperature of 1090°C. The air flow is 95 kg/s. Determine the maximum
propulsive force that can be produced by the engine.
Problem 1.6: A piston-cylinder device contains 0.05 m3 of a gas initially
at 200 MPa. At this state, a linear spring that has spring constant of 150
kN/m is touching the piston but exerting no force on it. Now heat is
transferred to the gas, causing the piston to rise and compress the spring until the volume inside the cylinder doubles. If the cross sectional area of the piston is 0.25 m2, determine the fraction of workdone by the gas against
the spring to compress it.
2.5g of water at 100K occupies a volume of 2.5cm3 at atmospheric pressure. When the water is boiled, it occupies
4178cm3 as steam. What is the change in its internal energy? The latent heat of vaporization is 2.26106 J / kg. the pressure of one atm is 1.013105 Nm.2
enthalpy of the steam at the entry of condenser is 200 kilo joule enthalpy of water at the exit of condenseris 100 kj what will be the work done by condensor
In a Stirling cycle, the pressure and temperature at the start of isothermal compression are 1 bar and 40°C. The compression ratio is 7 and the maximum temperature in the cycle is 1200°C. Determine;
i) The maximum pressure and the mean effective pressure
ii) The thermal efficiency of the cycle with and without a regenerator
A backyard swimming pool is 12 feet in diameter and 36 inches
deep. It is filled with water from a hose at 8.0 degrees celcius.
Determine the amount of heat that must be added to the water to
raise the temperature to 28 degrees celcius. The specific heat
capacity of water is 4186 J/kg/C.
If the compressor of example 5.1 is to be driven at 300 rev/min and is single-acting single-cylinder machine, calculate the cylinder bore required, assuming a stroke to bore ratio of 1.5:1. Calculate the power of the motor required to drive the compressor if the mechanical efficiency of the compressor is 85% and that of the motor transmission is 90%. Determine also the isothermal efficiency of the compressor.
