Monthly Archives: April 2013

How does the value of an inverse cosine function change when the unit of its argument changes?

How does the value of differ from ?   This is an interesting question, especially because the question of units in trigonometric and inverse trigonometric functions is rarely discussed in mathematics textbooks.   If you’re interested, think this problem through … Continue reading

Posted in Mathematics | Tagged , , , | 2 Comments

Why do Airplanes Fly?

In many physics textbooks, the explanation for lift on a flying airplane is that the top of a plane’s wing is longer than the bottom, and so air must travel faster across the top than the bottom, and therefore the … Continue reading

Posted in Physics | Tagged , , , , | 4 Comments