Explanation Write the formula for mass flow rate ( m ˙ ) . m ˙ = AV v (I) Rearrange the Equation (I) to obtain velocity ( V ) . V= m ˙ v A (II) Here, the cross sectional area is A , the velocity is V and the specific volume is v . The duct possess the cross section of rectangle. Write the formula for area of rectangle. A = l b (III) Here, the length and breadth of the rectangle is l and b respectively. Write the expression of ideal gas equation in terms of specific volume. P v = R T v = R T P (IV) Here, the pressure is P , the specific volume is v , the universal gas constant is R and the temperature is T . Conclusion: Substitute 5 ft for l and 4 ft for b in Equation (III). A = ( 5 ft ) ( 4 ft ) = 20 ft 2 Substitute 1545.3489 ft ⋅ lbf lb-mol ⋅ °R for R , 70 ° F for T and 20 lbf/in . 2 for P in Equation (IV). v = ( 1545.3489 ft ⋅ lbf lb-mol ⋅ °R ) ( 70 ° F ) 20 lbf/in

Fundamentals of Engineering Thermodynamics

8th Edition

ISBN: 9781118832318

Author: MORAN

Publisher: WILEY

See similar textbooks

Videos

Question

Chapter 4.12, Problem 4P

To determine

The velocity of the air in ft/s.

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Chapter 4.12, Problem 3P

Chapter 4.12, Problem 5P

Students have asked these similar questions

got wrong answers help please

A crate weighs 530 lb and is hung by three ropes attached to a steel ring at A such that the top surface is parallel to the xy plane. Point A is located at a height of h = 42 in above the top of the crate directly over the geometric center of the top surface. Use the dimensions given in the table below to determine the tension in each of the three ropes. 2013 Michael Swanbom cc00 BY NC SA ↑ Z C b B У a D Values for dimensions on the figure are given in the following table. Note the figure may not be to scale. Variable Value a 30 in b 43 in 4.5 in The tension in rope AB is 383 x lb The tension in rope AC is 156 x lb The tension in rope AD is 156 x lb

A block of mass m hangs from the end of bar AB that is 7.2 meters long and connected to the wall in the xz plane. The bar is supported at A by a ball joint such that it carries only a compressive force along its axis. The bar is supported at end B by cables BD and BC that connect to the xz plane at points C and D respectively with coordinates given in the figure. Cable BD is elastic and can be modeled as a linear spring with a spring constant k = 400 N/m and unstretched length of 6.34 meters. Determine the mass m, the compressive force in beam AB and the tension force in cable BC. Z C D (c, 0, d) (a, 0, b) A B y f m cc 10 BY NC SA 2016 Eric Davishahl x Values for dimensions on the figure are given in the following table. Note the figure may not be to scale. Variable Value a 8.1 m b 3.3 m с 2.7 m d 3.9 m e 2 m f 5.4 m The mass of the block is 68.8 The compressive force in bar AB is 364 × kg. × N. The tension in cable BC is 393 × N.

Chapter 4 Solutions

Fundamentals of Engineering Thermodynamics

Ch. 4.12 - Prob. 1E Ch. 4.12 - 2. When a drip coffeemaker on-off switch is turned...Ch. 4.12 - Prob. 3E Ch. 4.12 - Prob. 4E Ch. 4.12 - Prob. 5E Ch. 4.12 - Prob. 6E Ch. 4.12 - Prob. 7E Ch. 4.12 - Prob. 8E Ch. 4.12 - Prob. 9E Ch. 4.12 - 10. How does the operator of a pumper-tanker fire...

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.

The velocity of the air in ft/s .

Videos

The velocity of the air in ft/s.

Want to see the full answer?

Chapter 4 Solutions