Physicists use back-of-the-envelope estimates to check whether or t an idea could possibly be right. In many cases, the approximate solution is all that is needed. This compilation of 101 examples of back-of-the-envelope calculations celebrates a quantitative approach to solving physics problems. Drawing on a lifetime of physics research and nearly three decades as the editor of The Physics Teacher, Clifford Swartz provides simple, approximate solutions to physics problems that span a broad range of topics. What te do you get when you blow across the top of a Coke bottle? Could you lose weight on a diet of ice cubes? How can a fakir lie on a bed of nails without getting hurt? Does draining water in the rthern hemisphere really swirl in a different direction than its counterpart below the equator? In each case, only a few lines of arithmetic and a few natural constants solve a problem to within a few percent. Covering such subjects as astromy, magnetism, optics, sound, heat, mechanics, waves, and electricity, the book provides a rich source of material for teachers and anyone interested in the physics of everyday life.
Clifford Swartz is a professor emeritus of physics at State University of New York, Stony Brook. He was the editor of The Physics Teacher for twenty-nine years and has written numerous physics texts for students from kindergarten to graduate level. He was the recipient in 2007 of the Melba Newell Phillips Award and in 1987 of the Oersted Medal, the most prestigious award of the American Association of Physics Teachers.