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The screencast video solutions here are second to none. Let Shaun Dychko, an expert physics teacher, guide you through every step.

Calculator Screenshots


Sometimes the difference between a right and wrong answer is how you plug it into your calculator. You won't make these kinds of mistakes since you will see how Shaun Dychko made the calculation.

Closed Captions

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Final Answer

Gravity formula

The best way to practice is to try the problem first, then check the final answer to quickly see if you got it right. Final answers are free, so just take a look.


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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 bryanlovell on Tue, 09/18/2018 - 10:54

In the video @ 45 seconds you have (1.898*10^27) but on the calculator you just do (1.898^27) Can you still get the correct answer doing it like that?

Submitted by ShaunDychko on Tue, 09/18/2018 - 11:04

Hi bryanlovell, thanks for the question. With a closer look at the calculator screenshot, notice the capital "E" between 1.897 and 27. This is my favorite shorthand way of writing "times 10^". It has an advantage over typing "* 10^27" since the calculator understands that 1.897E27 should be treated as a single number. This means that when dividing by 1.897E27, the 10^27 factor stays in the denominator where it belongs with the 1.897 factor. To explain by example, for the problem $\dfrac{20}{10} = 2$, typing "20 / 1E1 = 2" which is correct, whereas "20 / 1 * 10^1 = 200" which is not the expected answer since the capital E wasn't used. Of course, one could type "20 / (1 * 10^1) = 2" to get the correct answer with brackets, but avoiding the trouble of typing those brackets is the whole point of the capital E shortcut.

I hope you enjoy the solutions,


In reply to by bryanlovell

Submitted by bryanlovell on Tue, 09/11/2018 - 06:09

Thank you for these videos. I do not have a strong math background and the textbooks don't really show all the work. Was able to get 100% on my last homework assignment. Well worth the money.

Submitted by ShaunDychko on Tue, 09/11/2018 - 06:36

Hi raffielliemarley, that's a fair question. Currently I'm accelerating coverage of more chapters by doing only the odds the first time through. After covering odds in every chapter I'll probably do all the evens, depending on survey results (https://www.surveymonkey.com/r/N5WX87Y) from students.

I hope the videos are helpful with your studies,


In reply to by raffielliemarley

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