Bundle: Sustainable Energy, 2nd + Mindtap Engineering, 1 Term (6 Months) Printed Access Card
2nd Edition
ISBN: 9781337896535
Author: Richard A. Dunlap
Publisher: Cengage Learning
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Chapter 2, Problem 15P
To determine
Find the amount of
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There are 20 cars traveling at constant speeds on a 1 mile long ring track and the cars can pass each
other freely. On the track 25% of the cars are traveling at 20 mph, 50% of the cars are traveling 10 mph,
and the remaining 25% of the cars are traveling at an unknown speed. It was known that the space mean
speed of all the cars on the track is 20 mph.
(a) What is the speed that the remaining 25% of cars are traveling at?
(b) If an observer standing on the side of the track counted the number and measured the speed of all
cars that passed her for one hour, what is the time-mean speed of all the cars the observer counted?
(c) What is the flow rate measured by the observer?
(d) What is the car density on the track? Does density times space mean speed equal flow rate?
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? [
Chapter 2 Solutions
Bundle: Sustainable Energy, 2nd + Mindtap Engineering, 1 Term (6 Months) Printed Access Card
Ch. 2 - A quantity has a doubling time of 110 years....Ch. 2 - The population of a particular country has a...Ch. 2 - Prob. 4PCh. 2 - Prob. 5PCh. 2 - The total world population in 2012 was about 7...Ch. 2 - The population of a state is 25,600 in the year...Ch. 2 - The population of a country as a function of time...Ch. 2 - Prob. 9PCh. 2 - Prob. 10PCh. 2 - Prob. 11P
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