Engineering Fundamentals (Looseleaf)
5th Edition
ISBN: 9781337703574
Author: MOAVENI
Publisher: Cengage
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Chapter 13, Problem 3P
An elevator has a rated capacity of 2200 lb. It can transport people at the rated capacity between the first and the fifth floors, with a vertical distance of 15 ft between each floor, in 7 s. Estimate the power requirement for such an elevator.
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Determine the work done by an electric motor lifting an elevator weighing 4 kN through five floors; assume a distance of 3 m between each floor. Compute the power requirements for the motor to go from the first to the fifth floor ina. 5 sb. 8 sExpress your results in watts .
Water at 50°F is pumped from a lake at 750 gpm through a length of 3-inch schedule 40 commercial steel pipe as shown below. The inlet to the pipe is eight feet below the surface of the lake. A 25-HP gasoline engine drives the pump and the pump has an efficiency of 80%
What is the Reynolds number in the pipe? Is the flow laminar or turbulent?
What is the head added to the water by the pump?
What is the head loss due to pipe friction?
A water tower that is 90 ft high provides water to a residential subdivision. The water main from the
tower to the subdivision is 6 in. sch 40 steel, 3 miles long. If each house uses a maximum of 50 gal/h (at
peak demand) and the pressure in the water main is not to be less than 30 psig at any point, how many
homes can be served by the water main?
Following are the number of valves and fittings:
2 standard 90-degree elbows
Two completely open valves, one after the tank and the other before exiting the water main
29 standard coupling (K= 0.04)
You noticed that the current piping system, which is above the ground, is vulnerable to tampering. Two
couplings and two standard 90-degree elbows would be required if the water main was buried 6 feet
underground. Will you be able to serve the same number of households as you did previously? Why?
Please start by stating all of your assumptions and design considerations.
Tips:
Solve both conditions
Underground and ground
Chapter 13 Solutions
Engineering Fundamentals (Looseleaf)
Ch. 13.2 - Prob. 1BYGCh. 13.2 - Prob. 2BYGCh. 13.2 - Prob. 3BYGCh. 13.2 - Prob. 4BYGCh. 13.2 - Prob. 5BYGCh. 13.2 - Prob. BYGVCh. 13.4 - Prob. 1BYGCh. 13.4 - Prob. 2BYGCh. 13.4 - Prob. 3BYGCh. 13.4 - Prob. 4BYG
Ch. 13.4 - Prob. BYGVCh. 13.5 - Prob. 1BYGCh. 13.5 - Prob. 2BYGCh. 13.5 - Prob. 3BYGCh. 13.5 - Prob. 4BYGCh. 13.5 - Prob. 5BYGCh. 13.5 - Prob. BYGVCh. 13 - Prob. 1PCh. 13 - Prob. 2PCh. 13 - An elevator has a rated capacity of 2200 lb. It...Ch. 13 - Prob. 4PCh. 13 - Prob. 5PCh. 13 - Prob. 6PCh. 13 - Prob. 7PCh. 13 - Prob. 8PCh. 13 - Prob. 9PCh. 13 - Prob. 10PCh. 13 - Prob. 12PCh. 13 - Prob. 14PCh. 13 - Prob. 15PCh. 13 - Prob. 16PCh. 13 - Prob. 17PCh. 13 - Prob. 18PCh. 13 - Prob. 19PCh. 13 - Prob. 20PCh. 13 - Prob. 22PCh. 13 - Prob. 23PCh. 13 - Prob. 24PCh. 13 - Prob. 25PCh. 13 - Prob. 26P
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