3–72 A spherical balloon with a diameter of 9 m is filledwith helium at 27°C and 200 kPa. Determine the mole num-ber and the mass of the helium in the balloon.Answers: 30.6 kmol, 123 kg3–73 EES Reconsider Prob. 3–72. Using EES (or other)software, investigate the effect of the balloondiameter on the mass of helium contained in the balloon forthe pressures of (a) 100 kPa and (b) 200 kPa. Let the diame-ter vary from 5 m to 15 m. Plot the mass of helium againstthe diameter for both cases.

Answered: Image /qna-images/answer/54b83369-b7e7-4886-ab0e-7b2ab7f3340e.jpg

Answered: A spherical balloon with a diameter of…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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During a picnic on a hot summer day, all the cold drinks disappear quickly, and the only available drinks are those at the ambient temperature of 85°F. In an effort to cool a 12-fluid-oz drink in a can, a person grabs the can and starts shaking it in the iced water of the chest at 32°F. Using the properties of water for the drink, determine the mass of ice that will melt by the time the canned drink cools to 37°F.
A rigid tank contains 20 lbm of air at a pressure of 20 lbf/in2 and 70°F. More air is added to the tank until the pressure and temperature rise to 35 lbf/in2 and 90°F, respectively. Determine the mass of air added to the tank
In a closed container of 2 liters, there is 1 kg of wet water vapor at a temperature of 25°C. a.) if the container is heated, does the liquid level increase? Is it reduced? Explain by drawing the P-ν diagram. b.) if the container had 0.1 kg of wet water vapor, what would be the situation when heated? Please explain by drawing the T-ν diagram.
Q2/ A 1-m' tank containing air at 25°C and 500 kPa is connected through a valve to another tank containing 5 kg of air at 35°C and 200 kPa. Now the valve is opened, and the entire system is allowed to reach thermal equilibrium with the surroundings, which are at 20°C. Determine the volume of the second tank and the final equilibrium pressure of air.
Q7/ A 1-m3 tank contains 2.841 kg of steam at 0.6 MPa. Determine the temperature of the steam, using (a) the ideal gas equation, (b) the van der Waals equation, and (c) the steam tables.
A 10-m3 tank contains nitrogen at 25°C and 800 kPa. Some nitrogen is allowed to escape until the pressure in the tank drops to 600 kPa. If the temperature at this point is 20°C, determine the amount of nitrogen that as escaped.
A rigid vessel of volume 0.02 m3 contains 0.054 kg of steam at an initial pressure of 4 bar. Heat is supplied to the steam from an external source. Calculate (i) the initial quality of the steam, (ii) the temperature and quality of the steam when the pressure becomes 4.5 bar, (iii) the pressure of the steam when it is just dry saturated, and (iv) the temperature when the pressure reaches 7 bar. Indicate the process on a P-V and T-V diagram for water. [Answers: (i) 0.8, (ii) 147.9°C, 0.894, (iii) 5.07 bar, (iv) 298.4°C]
The temperature in a pressure cooker during cooking at sea level is measured to be 250°F. Determine the absolute pressure inside the cooker in psia and in atm. Would you modify your answer if the place were at a higher elevation?
a rigid tank contains 50kg of saturated liquid water at 90 degrees Celcius. if you add heat to the tank, could you determine the change of the state?
The piston-cylinder system shown above contains R-410a at 20°C and 100 kPa. If the temperature of the R-410a is increased to 50°C the specific volume in the piston-cylinder is ?
One kilogram of R-134a fills a 0.14-m3 weighted piston–cylinder device at a temperature of –26°C. The container is now heated at constant pressure until the temperature is 100°C. Determine the final volume of the R-134a.
A 725L rigid tank contains steam (water vapor) having a temperature of 125°C and pressure of 0.2 bars. Determine the mass of the steam.

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A spherical balloon with a diameter of 9 m is filled with helium at 27°C and 200 kPa. Determine the mole num- ber and the mass of the helium in the balloon. Answers: 30.6 kmol, 123 kg