Anideal gas with a mass of 2 kg reversibly and polytropically expands up to 3 times its initial volume in a piston-cylinder assembly. The temperature of the ideal gas drops from 300° C to 60° C. (a) If the heat energy inputis 20 kJ and the boundary work output is 100 kJ, the specificheats of the gas cv [kJ/ kgK] and find the cp [kJ/kgK] values. (b) If the heat energy output is 20 kJ and the boundary work output is 100 kJ, the specificheats of the gas cv [kJ / kgK] (c) Find the value k, which is the ratio of specificheats. (d) If the heat energy input is 20 kJ, the boundary work output is 100 kJand the entropy generation is 0.36 kJ/ K, then the thermal energy Calculate the source temperature as [° C].

Anideal gas with a mass of 2 kg reversibly and polytropically expands up to 3 times its initial volume in a piston-cylinder assembly. The temperature of the ideal gas drops from 300° C to 60° C. (a) If the heat energy inputis 20 kJ and the boundary work output is 100 kJ, the specificheats of the gas cv [kJ/ kgK] and find the cp [kJ/kgK] values. (b) If the heat energy output is 20 kJ and the boundary work output is 100 kJ, the specificheats of the gas cv [kJ / kgK] (c) Find the value k, which is the ratio of specificheats. (d) If the heat energy input is 20 kJ, the boundary work output is 100 kJand the entropy generation is 0.36 kJ/ K, then the thermal energy Calculate the source temperature as [° C].

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

In the United States, electricity is sold using the SI units of kilowatt (kW) or megawatt (MW), and fuel for power generation stations is generally purchased using English units, e.g., British thermal unit (Btu), gallon (gal), and ton. An industrial power plant has an average annual load of 100 MW (electrical). If the overall thermal efficiency is 33% (based on HHV), what is the annual cost of fuel if the plant is fired with (a) natural gas, (b) No. 2 fuel oil, and (c) bituminous coal? Use the data from Tables 2.2, 2.7, and 2.13. Assume the cost of natural gas is $5/million Btu, the cost of No. 2 fuel oil is $3/gal, and the cost of bituminous coal is $60/ton (1 ton = 2000 lbm)
Provide clear and complete solution as well as diagram. The discharge pressure of an air compressor is 8 times the suction pressure. If volume flow at suction is 0.23 m3/s, what is the compressor power assuming n equals 1.35 and suction pressure is 97 kPa? A. 64.58 kW C. 60.45 kWB. 61.48 kW D. 71.5 kW
Suppose we got the following data during a test of a 2- stroke engine in which gas is usedas a fuel:Diameter of the piston = 149 mmStroke length = 179 mmClearance volume = 0.88 literrpm of the engine = 302Indicated mean effective pressure = 6.0 barGas consumption = 6.0 m3/hCalorific value of the gas (fuel) = 16990 kJ/m3Make a clear sketch the geometry of this engine using the data and determine thefollowing:i. Indicated power developed by the engine in watt.ii. Air Standard Efficiencyiii. Indicated thermal efficiency of the engine.
While camping, you observe a lightning bolt, and 4.0 s later you hear the associatedthunder. How far away is the strike?
Suppose that in some location, thermal solar electricity can be produced at a cost of 4¢ per kilowatt hour (kWh), while electricity from coal costs 3.5¢ per kWh (note that thermal solar can be stored up and released overnight, so you can assume that there are no problems with intermittency). Suppose there is enough coal to last 100 more years at current use levels, and suppose for now that virtually all of the cost of making electricity from coal is the coal itself.7 If the real rate of interest is 2%, what do you expect to happen to the current price of coal?
THERMODYNAMICS. Question I. 0.04 kg/s of an ideal gas (molecular weight 30, ratio of specific heats 1.5) flows through a duct with a cross sectional area of 10 cm?. The pressure and temperature are 100 kPa and 350 K. What is the velocity of this gas flow, in m/s?
As measured by NASA’s Viking landers, the atmosphereof Mars, where g ≈ 3.71 m/s 2 , is almost entirely carbondioxide, and the surface pressure averages 700 Pa. The temperatureis cold and drops off exponentially: T ≈ T o e - Cz ,where C = 1.3E-5 m - 1 and T o = 250 K. For example,at 20,000 m altitude, T ≈ 193 K. ( a ) Find an analyticformula for the variation of pressure with altitude.( b ) Find the altitude where pressure on Mars has droppedto 1 pascal.
As2...Suppose that we could increase the atmospheric pressure on the surface of Mars to 0.2 bar, by vaporizing the polar caps and subsurface ice. This atmosphere would then likely decrease over time, as a result of several processes, such as escape into space, and erosion by the solar wind. How would the surface pressure decrease as a function of time? How much time would it take until the pressure is only 0.1 bar?
(a) A substance flows through a turbine at the rate of 100 lb./min with ΔKE = 0 and Q = 0. At entry, its pressure is 175 psia, its volume is 3.16 ft.3/lb., and its internal energy is 1166.7 BTU/lb. At exit, its pressure is 0.813 psia, its volume is 328 ft.3/lb., and its internal energy is 854.6 BTU/lb. What horsepower is developed? (b) The same as (a) except that the heat loss from the turbine is 10 BTU/lb. of steam.
A diesel engine produces 500 kW at 3800 rpm while consuming 0.02975 kg/s of fuel. During operation, data shows that its mechanical energy loses 17%, the actual volume of air going into each cylinder is 90% (The volumetric efficiency has a negligible variation) and the actual fuel to air ratio is 0.05. If the ambient temperature at this location is 18 0C and the standard atmospheric condition is 14 0C hotter with pressure of 100 kPa, what are the standard parameters of the engine: a. Brake Power, kW b. Indicated Specific Fuel Consumption, kg/kW-hr c. Mass of air, kg/s d. Indicated Mean Effective Pressure, kPa WRONG ANSWERSSSSSS a. 415 b. 0.2147 c. 0.595 d. 35.31 THESE ARE THE WRONG ANSWERS. SHOW CORRECT ANSWER
A balloon filled with helium (of density ρHe = 0.164 kg/m3 ) has a cube shape and rises through the stratosphere. Air density is given by ρ(z) = ρa exp(− gz/ RT), where ρa = 1.225 kg/m3 is the density of air at the sea level, g = 9.81 m/s^2 is the gravitational acceleration, R = 287.06 J/kg/K is the specific gas constant of air, and T is the air temperature, which is constant in the stratosphere and equal to 217 K (Note that this expression for the atmospheric density is strictly correct only in the isothermal region of the stratosphere. However, please use it for solution to this problem). This balloon is designed so that ρHe and its side length h = 30 cm remain constant for all z. The lower surface is located at z and the upper surface at z + h. Derive an expression for the buoyancy force on the balloon and compute the maximum altitude to which the balloon rises in a unit of m.
You are being tasked as a wind tunnel engineer to investigate the performance of newly designed high-speed wind tunnel in UPNM. An exhaust gas flows through a nozzle where the inlet area is 5,000 cm2.At this inlet, the gas has a velocity of 1,200 m/s, temperature of 1,500oC,and pressure of 6,000 kPa. Initial measurement revealed that the pressure at the exit of the wind tunnel is 100 kPa. Based on this information, analyze and investigate ; i. Mach number at inlet of the nozzle ii. The velocity of gas at exit iii. The area of the nozzle at exit Take specific heat ratio for the exhaust gas, ? to be 1.7 and the gas constant, R to be 205 J/kg.