Category Archives: Learning Physics

Learn something new. This is meant for students, teachers, or anyone interested in physics

Relativity – Part I: Why is Relativity Exciting to Study?

2015 is the 100th anniversary of Einstein’s general theory of relativity.  In particular, on November 25, 1915, Einstein published the gravitational field equations of general relativity.  Ten years prior, in 1905, Einstein published his special theory of relativity.  To celebrate … Continue reading

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Energy vs. Momentum – The Veritasium Video

A couple of days ago I noticed a blog post from Chad Orzel entitled How Deep Does Veritasium’s Bullet Go?.  It links to a video by Veritasium that asks which block goes higher, one shot with a bullet on center, … Continue reading

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Work Done By The Human Heart

I was reading a book on thermodynamics and for some reason they threw in the fact that each beat of a human heart is about 1 joule. Of course I did what any self-respecting scientist does, I reached for the … Continue reading

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More Pulling Yourself Up by Your Bootstraps – Ninja Warrior Salmon Ladder

A while back I did a couple of posts about Danny Macaskill, a highly talented cyclist who can do things with a bike that I can’t even imagine doing. I recently saw a post on Rhett Allain’s Dot Physics about … Continue reading

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How Schlieren Imaging Works

If you’ve ever seen the wavering air above a hot road, or the heat shimmer over a hot kettle you’re already half-way to making a Schlieren image. In physics you very rarely ever directly measure the thing you are interested … Continue reading

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How High Can Mountains Be?

Last month Rhett Allain posted about the famous Bent Pyramid in Egypt. As part of his calculations he estimated how high a stack of stone blocks can be without collapsing. The value he came up with was 3200 m, which … Continue reading

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Photosynthesizing Felines – A Back of the Envelope Calculation

The other day I was out weeding in the garden, amazed at the ability of weeds to take over all the tasty plants.  Just think of all the energy that must go into growing these weeds, just to be heartless … Continue reading

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