Solid Waste Engineering: A Global Perspective, Si Edition
3rd Edition
ISBN: 9781305638600
Author: William A. Worrell, P. Aarne Vesilind, Christian Ludwig
Publisher: Cengage Learning
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Chapter 4, Problem 4.15P
To determine
Size of motor used for this shredder
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2.21 A small truck is to be driven down a 4% grade
at 70 mi/h. The coefficient of road adhesion is 0.95,
and it is known that the braking efficiency is 80%
when the truck is empty and decreases by one
percentage point for every 100 lb of cargo added.
Ignoring aerodynamic resistance, if the driver wants
the truck to be able to achieve a minimum
theoretical stopping distance of 275 ft from the
point of brake application, what is the maximum
amount of cargo (in pounds) that can be carried?
An observer standing beside a one-lane road counted in 5 minutes 20 cars traveling at 30 mph, 30 cars
traveling at 50 mph and 10 cars traveling at 60 mph.
(a) What is the space and time-mean speeds of the observed cars?
(b) What is the average headway of the cars? [
2.20 A driver is traveling at 90 mi/h down a 3%
grade on good, wet pavement. An accident
investigation team noted that braking skid marks
started 410 ft before a parked car was hit at an
estimated 45 mi/h. Ignoring air resistance, and using
theoretical stopping distance, what was the braking
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Solid Waste Engineering: A Global Perspective, Si Edition
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