The local atmospheric pressure in Denver, Colorado (elevation 1610 m), is83.4 kPa Air at this pressure and 20°C flows with a velocity of 8 m/s over a 1.5 mx6m flat plate whose temperature is 140°C as shown in Fig below. Determine the rate ofheat transfer from the plate if the air flows parallel to the (a) 6-m-long side.

Step 1: Step 2: Step 3: Step 4:

Answered: The local atmospheric pressure in…

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

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Warm air is contained in a piston-cylinder assembly oriented horizontally. The aircools slowly from an initial volume of 0.003 m 3 to a final volume of 0.002 m 3 . Duringthe process, the spring exerts a force that varies linearly from an initial value of 900 Nto a final value of zero. The atmospheric pressure is 100 kPa, and the area of thepiston face is 0.018 m 2 .Friction between the pistonand the cylinder wall can beneglected. For the air in thepiston-cylinder assembly,determine the initial and finalpressures, each in kPa andatm.
An ideal gas flows in a pipe at 37°C. The density of the gas is 1.9 kg/m3 and its molar mass is 44 kg/kmol. The pressure of the gas is (a) 13 kPa (b) 79 kPa (c) 111 kPa (d ) 490 kPa (e) 4900 kPa
Consider an adiabatic duct of diameter 12 cm with inlet conditions of the velocity, temperature, pressure and Mach number as indicated in the figure below. Take the average friction factor to be 0.021. determine the duct length from the inlet where the inlet velocity doubles, also determine the pressure drop along that section of the duct. For air, take k = 1.4, specific heat at constant pressure and gas constant to be 1.005 kJ/kg-K and 0.287 kJ/kg-K respectively. L P₁ = 200 kPa T₁ = 550 K Ma₁ = 0.4 + f=0.021 L Exit Ma₂=0.8 L₂Ⓡ Mal T* p
A closed vessel comprises air at a pressure of 140 kPag and temperature of 20°C. Assuming thatatmospheric pressure is 759 mmHg, determine the final gauge pressure (in kPag) if the air is heatedat constant volume to 40°C.
Consider the flow of air over the wings of an aircraft. Is this flow internal or external? How about the flow of gases through a jet engine?
Steam at 500kPa and a quality of 90 percent occupied a rigid vessel of volume 0.3m2. Calculate the mass, internal energy, and enthalpy of the steam.
Liquid water enters a 10-m-long smooth rectangular tube with a 50 mm and b = 25 mm. The surface temperature is kept constant, and water enters the tube at 20°C with a mass flow rate of 0.25 kg/s. Determine the tube surface temperature necessary to heat the water to the desired outlet temperature of 80°C Find the pumping power.
Five hundred kilograms per hour of steam drives a turbine. The steamenters the turbine at 44 atm and 450C at a linear velocity of 60 m/sand leaves at a point 5 m below the turbine inlet at atmosphericpressure and a velocity of 360 m/s. The turbine delivers shaft work at arate of 70 kW, and the heat loss from the turbine is estimated to be 104kcal/h. Calculate the specific enthalpy change associated with theprocess
The fluid is heated from 125 degrees Fahrenheit to 225 degrees Fahrenheit. Consider an ideal gas with thefollowing characteristics: R = 85 ft-lbf/lbm-RCp = 0.35 + 0.000325T BTU/lbm-R If the heating is at constant volume, compute for (a) the change in internal energy, (b) the change in enthalpy,and (c) the change in entropy. If the heating is at constant pressure, compute for (d) the change in entropy, and (e) the value of k at 160 degrees Celsius. If the fluid undergoes an isentropic process, determine (f) non-flow work and (g) steady-flow work. (For item f and g, use the value of k at 160 degrees Celsius)
Oil at 20°C is flowing through a vertical glass funnel that consists of a 20-cm-high cylindrical reservoir and a 1-cm-diameter, 40-cm-high pipe. The funnel is always maintained full by the addition of oil from a tank. assuming (a) the diameter of the pipe is tripled and (b) the length of the pipe is tripled while the diameter is maintained the same., determine the flow rate of oil through the funnel and calculate the “funnel effectiveness,” which is defined as the ratio of the actual flow rate through the funnel to the maximum flow rate for the “frictionless” case.
The pressure of an automobile tire is measured to be 190 kPa (gage) before a trip and 215 kPa (gage) after the trip at a location where the atmospheric pressure is 95 kPa. If the temperature of air in the tire before the trip is 25°C, the air temperature after the trip is (a) 51.1°C (b) 64.2°C (c) 27.2°C (d) 28.3°C (e) 25.0°C
An electric current is passed through a wire 1 mm in diameter and 10cm long. The wire is submerged in liquid water at atmosphericpressure, and the current is increased until the water boils. For thissituation h=5000W/m2◦C, and the water temperature will be 100◦C. How much electric power must be supplied to the wire to maintain the wire surface at 114◦C?

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