`pPrinciples of Physics Text Chapter 20, Problems 1-3 and 9-13

`gText Chapter 20, Problems 1-3, 6, 8, 9-13, 16, 13, 18, 21, 32

`uUniversity Physics:  Chapter 27 Problems 55, 56, 60, 66, 71, 72, 74, 78, 81, 84; Chapter 28 Problems 55, 58, 63, 68, 70

`pPrinciples of Physics Text Chapter 20, Problems 1-6, 13, 31-33, 50, 51

`gText Chapter 20, Problems 1-6, 10, 13, 14, 21, 31-33, 36, 50, 51, 55