Thinking Like an Engineer: An Active Learning Approach (4th Edition)
4th Edition
ISBN: 9780134639673
Author: Elizabeth A. Stephan, David R. Bowman, William J. Park, Benjamin L. Sill, Matthew W. Ohland
Publisher: PEARSON
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Textbook Question
Chapter 8, Problem 62ICA
An average cloud-to-ground lightning strike delivers about 0.5 (half) a gigajoule [GJ] of energy to the Earth. Assuming that 25 coulombs [C] of charge was delivered with a current of 40 kiloamperes [kA], answer the following questions. Express the answers using an appropriate SI prefix such that there are only 1, 2, or 3 digits shown to the left of the decimal.
- a. How long did the lightning strike last, in units of seconds [s]?
- b. What was the voltage between the cloud and the ground in units of volts [V]?
- c. If an experimental lightning capturing system was able to store this energy with an efficiency of 15%, how many such strikes would be necessary to power an average American home for one year, assuming the average yearly energy usage is 600 gigajoules [GJ]?
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The tube, shown below, is
supported by two cables (AB) and
(AC). A force F = 600 lb is applied in
cable AB. The component of the
force F acting along cable (AC) is:
|3 ft,
E 8 ft
В
12 ft
8 ft
F
15 ft
A
Select one:
a. 49.509 [lb]
b. 495.708 [lb]
c. 600 [lb]
d. 459.708 [lb]
E
E
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1
300
[mm]
A door handle is acted on by a vertical force, F, at point B and a couple, E, about the point O. The force and couple can be replaced by a single, equivalent force, R, applied on the door handle.
F
E
W
500
250
100
[N]
[N]
[mm]
B
Given the information in the table above, determine:
1) the sum of moments by the force and couple,
[N-m), (3 sigfig) CW
F
40
[mm]
2) the distance along the lever from O that the equivalent force acts at,
[mm], (3 sigfig)
A five-cylinder, 3.5-liter SI engine operates on a four-stroke cycle at 2500 RPM. At this
condition, the mechanical efficiency of the engine is 62% and 1000 J of indicated work are
produced each cycle in each cylinder.
Calculate:
(a) Indicated mean effective pressure. [kPa]
(b) Brake mean effective pressure. [kPa]
(c) Friction mean effective pressure. [kPa]
Chapter 8 Solutions
Thinking Like an Engineer: An Active Learning Approach (4th Edition)
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