A spherical hot-air balloon is initially filled with air at 120 kPa and 20°C with an initial diameter of 5 m. Air enters this balloon at 120 kPaand 20°C with a velocity of 3 m/s through a 1-m-diameter opening. How many minutes will it take to inflate this balloon to a 16.50-mdiameter when the pressure and temperature of the air in the balloon remain the same as the air entering the balloon? The gasconstant of air is R = 0. 287 kPa m³/kg K. (Round the final answer to three decimal places.)Getty ImagesThe time it takes to inflate the balloon ismin.

Answered: Image /qna-images/answer/0ba1de3d-5973-4f04-bde7-e3618528a580.jpg

Answered: A spherical hot-air balloon is…

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

A cylinder-piston device provided with stops, so that the water supports the weight of the piston, and the force of the atmosphere,It contains water, initially at 300 kPa and 0.5 m3 / kg. The water is heated to a saturated steam condition and the plunger rests on the stops. With the plunger on the stops, the water is heated up to the pressure of 600 kPa. In the P-V and T-V diagrams, with respect to the saturation lines, the process curves go through the initial and final states of the water. On both T-V and P-V diagrams draw the isotherms that pass through both states, and show their values in ° C, in the isotherms. (see img 1)
What is the new temperature (in K) of a closed gas system when it's volume is compressed from 5.6 L to 2.3 L and initial temperature was 455ﾟ K
A 10 cu. m vessel initially contains 5 cu. m of liquid water and 5 cu. m of saturated water vapor at 100 kPa. calculate the internal energy of the system using the steam table.
Air initially at 100 kPa and 300K undergoes a constant pressure until it reaches a final temperature of 620K Determine: The work per kilogram of air The heat required per kilogram of air The change in internal energy, in Kj/kg The change in entropy, kJ/kg-K
An air compressor takes in air at a pressure of 100 kPa and a temperature of 300 K. The compressor is cooled at a rate of 15 k/kg and the mass flow rate is 50 kg/minute. The air leaves at a pressure of 600 kPa and a temperature of 420 K. What is the work that needs to be input to the compressor to achieve this rate of flow? You may use a cp of 1.006 k/kg-K. Give your answer to three significant digits in kilowatts.don't put kw in your answerl) COMPRESSOR SECTION Compressor housing Compressor a dicharge Compreor anbient a Compreor wheel
Saturated liquid refrigerant 134a at 900 kPa is throttled to a pressure of 200 kPa. What is the temperature change during this process, and the final density of the refrigerant?
A jet plane travels in air at pressure of 101.325 kPa and 10°C at a speed of 2000 kph. Based on the sonic velocity, the type of flow is Blank 1.
Need help with this book problem using thermodynamics Nitrogen gas at constant pipeline conditions of 200 kPa and 300 K passes slowly through a valve into a well-insulated, frictionless, and initially evacuated piston-cylinder assembly. A pressure of 150 kPa in the cylinder is needed to support the piston due to its own weight and the ambient atmosphere. The volume under the piston is 1 m3 at the end of the process. Find (a) the boundary work done during this process, (b) the final temperature of the nitrogen in the cylinder, and (c) the mass that enters the cylinder during the process.
A piston/cylinder setup contains 1 kg of air at 20°C with an initial volume of V1=0.1 m3. Initially, the piston rests on some stops, but it is possible for it to move within the cylinder without friction. To lift the piston and start such motion, an air pressure of 1400 kPa is required. Now, heat is transferred to the system so that the temperature of the air reaches to a final value of 300°C.
Nitrogen is isobarically expanded from 100 kPa and 600 K until the volume doubles in a closed piston-cylinder. Assume that specific heats are constant and evaluated at the average temperature. Hint: Nitrogen is an ideal gas.Determine the amount of heat transfer into the system, in kJ/kg? Calculate the change of enthalpy, in kJ/kg?Calculate the change of internal energy, in kJ/kg? Report your answer to the nearest whole number using rounding.
Air enters a nozzle at 30 psia, 630 R, and a velocity of 450 ft/s. Approximating the flow as isentropic, determine the pressure and temperature of air at a location where the air velocity equals the speed of sound. What is the ratio of the area at this location to the entrance area?
Air with an initial density of 1.285 kg/m³ is passed through a compressor with an inlet diameter of 50 mm. The air enters the compressor at a speed of 60 m/s and a pressure of 105 kPa. At the outlet, the diameter of the pipe is 10 mm. The pressure is 7 bar, and the density of the air is 6 kg/m?. The rate of heat loss from the compressor is 2 kW. (a) Determine the temperatures at the inlet and outlet. The gas constant for air, R = 287 J/kgK. (b) Determine the mass flow rate for the air and the speed of the air at the outlet. (c) Write down a simplified version of the first law for this system. (d) Determine the required rate of work input to the power the compressor. The specific heat capacity of air, Cp = 1005 J/kgK.

SEE MORE QUESTIONS

Recommended textbooks for you

Elements Of Electromagnetics

Mechanical Engineering

ISBN:

9780190698614

Author:

Sadiku, Matthew N. O.

Publisher:

Oxford University Press

Mechanics of Materials (10th Edition)

Mechanical Engineering

ISBN:

9780134319650

Author:

Russell C. Hibbeler

Publisher:

PEARSON

Thermodynamics: An Engineering Approach

Mechanical Engineering

ISBN:

9781259822674

Author:

Yunus A. Cengel Dr., Michael A. Boles

Publisher:

McGraw-Hill Education

Elements Of Electromagnetics

Mechanical Engineering

ISBN:

9780190698614

Author:

Sadiku, Matthew N. O.

Publisher:

Oxford University Press

Mechanics of Materials (10th Edition)

Mechanical Engineering

ISBN:

9780134319650

Author:

Russell C. Hibbeler

Publisher:

PEARSON

Thermodynamics: An Engineering Approach

Mechanical Engineering

ISBN:

9781259822674

Author:

Yunus A. Cengel Dr., Michael A. Boles

Publisher:

McGraw-Hill Education

Control Systems Engineering

Mechanical Engineering

ISBN:

9781118170519

Author:

Norman S. Nise

Publisher:

WILEY

Mechanics of Materials (MindTap Course List)

Mechanical Engineering

ISBN:

9781337093347

Author:

Barry J. Goodno, James M. Gere

Publisher:

Cengage Learning

Engineering Mechanics: Statics

Mechanical Engineering

ISBN:

9781118807330

Author:

James L. Meriam, L. G. Kraige, J. N. Bolton

Publisher:

WILEY

SEE MORE TEXTBOOKS