Giancoli 7th Edition textbook cover
Giancoli's Physics: Principles with Applications, 7th Edition
Introduction, Measurement, Estimating
Change chapter

1-4: Measurement, Uncertainty, Significant Figures
1-5 and 1-6: Units, Standards, SI, Converting Units
1-7: Order-of-Magnitude Estimating
1-8: Dimensions

Question by Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014, Reprinted by permission of Pearson Education Inc., New York.
Problem 27

Estimate how many hours it would take to run (at 10 km/h) across the U.S. from New York to California.

500 hours, or 60 days
Giancoli 7th Edition, Chapter 1, Problem 27 solution video poster

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This is Giancoli Answers with Mr. Dychko. Time is distance divided by speed so we have 5000 kilometers to go from New York to California divided by 10 kilometers an hour which we'll assume is the running speed here and so that's gonna work out to 500 hours and let's multiply that by 1 day for every 8 hours 8 hours of running you know, you have to sleep or at least take rest for the rest of the day and that means it would take about 60 days if you were to run about 8 hours per day to get across the US.

By robina.winkler on Tue, 6/2/2020 - 2:39 PM

your answers do not match the answers in the back of the book. it seems they were looking for the 500h. answer alone.

By Mr. Dychko on Tue, 6/9/2020 - 5:51 PM

Yes, and the question does ask "how many hours..." I've added the number of hours to the quick answer.

By brandi_cantu1 on Sun, 9/5/2021 - 8:58 PM

Thank you!

By Mr. Dychko on Tue, 9/7/2021 - 7:11 PM

I'm glad it was helpful!

By GnosisFreu on Sat, 1/7/2023 - 5:24 AM

How were we supposed to know, or why does the textbook assume that we know the distance between new york and California? Where does the 5000 number come from? The question only provided 10 km per hour for speed

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