Answered: a car 40 miles down the road as opposed…

ENGR.ECONOMIC ANALYSIS

14th Edition

ISBN:9780190931919

Author:NEWNAN

Publisher:NEWNAN

Chapter1: Making Economics Decisions

Section: Chapter Questions

Problem 1QTC

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Need help with 4,5 & 6 4) Determine the cost of 1 gallon of gasoline. Calculate the labor cost equivalent of those 2 people to push a car 40 miles. (You have to make assumptions on how much you would have to pay someone per hour to push a car). How much cheaper is it to use a gallon of gasoline to move a car 40 miles down the road as opposed to paying 2 people to push the car 40 miles down the road. 5) How much energy (in Joules and in food calories) do you estimate it would take two people to push a car 40 miles down the road. (1 food calorie = 4,186 J) The basic metabolic rate for the human body is about 60 (food) calories per hour. A runner running 10 miles at 6 minutes per mile burns about 1000 food calories per hour. Estimate how many calories per hour a person pushing a car at walking speed would burn (remember there are 2 people pushing at the same time) 6) Assuming that the car was traveling at 45 miles per hour (a very efficient speed for a car). How long does it take for the car to travel 40 miles?

Given,
Mass of the car
1000kg (2200lb)
Detance travelled by the car=
40 miles bey burming
gallon of gasolline.
O 1 gallon of- gasoline s equivalent to
1. 3X108
Joule.
O
Today's
cars efficiency= 25%
older cars eficiency = 10% and 15% in 19505
and 1960s
If the car have 10% 'effíciency,
Then,
Milage
x 40 miles by burning 1 gallon
of gasoline
=.10
25
= Ib miles
The old milagas, of Car having. 10% efficiency
Ps 16 miles by burning 1 gallon of gasoline
travelled
If the carhave 15% efficiency,
Milage
•15
x 40
24 miles
The old milage of car havng 15% efficiency
is 24 miles travelling by burning 1 aglon of gasoline-

3 The. length of the road
40 miles
The average. speed of a person is
3 to 4 miles
per
hour
So, assume that the
persons
can
trave
4
miles
per
hour,
Then, given its a flat straight voad and
a people. are pushing. the Vehicle,
So, total time to travel 40 miles can
be, t=
40 miles
A miles/nour
It will take to hours to travel. 40
to hours
=
miles.

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