College Physics
OER 2016 Edition
ISBN: 9781947172173
Author: OpenStax
Publisher: OpenStax College
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Textbook Question
Chapter 2, Problem 11CQ
If you divide the total distance traveled on a car trip (as determined by the odometer) by the time for the trip, are you calculating the average speed or the magnitude of the average velocity? Under what circumstances are these two quantities the same?
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An adventure racer ran 1.7 km north, then 3.2 km 63° to the south of due east, then
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Express your answer in metres/second to two decimal places (do not include units in
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Speedometer readings for a vehicle (in motion) at 13-second intervals are given in the table.
t (sec)
v (ft/s)
28
13
21
26
24
39
19
52
26
65
18
Estimate the distance traveled by the vehicle during this 65-second period using the velocities at the
beginning of the time intervals.
We can do this by approximating the area under a curve. But what curve? In this case, imagine that the
velocity of the vehicle is a function of time, v(t). We do not have this function, but we do have the values
of th
function at certain points in time. If we assume the function (the velocity) is constant between
these points in time (which is not actually true), we can get an approximation.
distance traveled -
feet
Give another estimate using the velocities at the end of the time periods.
distance traveled
feet
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Chapter 2 Solutions
College Physics
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