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Final Answer

Gravity formula

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Corresponding textbooks

College Physics Answers offers screencast video solutions to end of chapter problems in the textbooks published by OpenStax titled "College Physics" and "College Physics for AP Courses". These textbooks are available for free by following the links below. Both the PDF and printed versions of these textbooks contain the same problems. The only difference is that "College Physics" omits the "Test Prep for AP Courses" section found only in the "College Physics for AP Courses" text, but otherwise the end of chapter problems are identical.

OpenStax College Physics AP textbook cover

College Physics for AP Courses

Publication Date
Aug. 12, 2015
ISBN-10: 1-938168-93-3
ISBN-13: 978-1-938168-93-2
ISBN-10: 1-947172-17-4
ISBN-13: 978-1-947172-17-3

Download the PDF for free from OpenStax

OpenStax College Physics AP textbook cover

College Physics

Publication Date
Jun. 21, 2012
ISBN-10: 1-938168-00-3
ISBN-13: 978-1-938168-00-0
ISBN-10: 1-947172-01-8
ISBN-13: 978-1-947172-01-2

Download the PDF for free from OpenStax

Recent questions and answers

Submitted by marievillafuerte on Tue, 06/12/2018 - 21:57

In the problem of part b you have 8/3 in the square root, but in your calculator you have 5. Is that an error?

Submitted by ShaunDychko on Wed, 06/13/2018 - 07:30

Nice catch marievillafuerte! Yes, that was an error. I've corrected it by uploading an updated calculator screenshot and changed the final written answer.

Thanks again, and best wishes with your studies,


In reply to by marievillafuerte

Submitted by marievillafuerte on Tue, 06/12/2018 - 20:20

On my table 5.1 Steele on ice for static friction is 0.40

Also, because she is initially stationary doesn't that mean she is not moving. Meaning that her acceleration would be zero?

Submitted by ShaunDychko on Tue, 06/12/2018 - 20:32

Hi marievillafuerte, thanks for the question. It's possible there's a typo in your edition of the text. Perhaps you're using an older printed version? I'm seeing 0.04 in the pdf downloaded from https://openstax.org/details/books/college-physics-ap-courses. Also, we expect a much lower coefficient for steel on ice since, from experience skating, the coefficient of static friction should be very small since it's really slippery standing on ice with skates on. 0.40 is a coefficient comparable to wood on wood (0.50), which is not slippery. Also, https://www.engineeringtoolbox.com/friction-coefficients-d_778.html gives a steel on ice static friction coefficient of 0.03.

The skater moves as a result of being pushed by other skaters so, while she does begin from rest, she will be accelerated by the push from her two fellow skaters.

Hope that helps,


In reply to by marievillafuerte

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