With Einstein’s e=mc2, the tutor investigates an old claim. When I was a kid, a friend of mine told me you can travel around the earth, not just once, but seven times, on the energy contained in a grain of …

Physics: around the world on a grain of sand? Read more »

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Likely, we’ve all heard this question posed: ¬†Would a penny dropped from…kill you? The tutor answers.   Recently I was asked if a penny dropped from the Eiffel Tower could kill someone below. It’s a familiar question. Sometimes the penny …

Physics: the case of the falling penny Read more »

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