Mechanical energy nonconservative forces, like frictional forces, will be present, but often they are of negligible values and the mechanical energy's being constant can therefore be a useful approximation. In elastic collisions, the mechanical energy is conserved but in inelastic collisions, some mechanical energy is converted into heat. The equivalence between lost mechanical energy (dissipation) and an increase in temperature was discovered by James Prescott Joule. Many devices are used to convert mechanical energy to or from other forms of energy, e.g. an electric motor converts electrical energy to mechanical energy, an electric generator converts mechanical energy into electrical energy and a
A Cellarful of Noise "A Cellarful of Goys". The phrase is also in the lyrics of Petula Clark's 1965 hit "I Know a Place". Harry Shearer "dramatically reproduced" quotations from this book for the Pop Chronicles music documentary. A Cellarful of Noise A Cellarful of Noise is the title of Brian Epstein's 1964 autobiography. His assistant, Derek Taylor, was the ghostwriter of the book, which describes the early days of The Beatles, whom Epstein managed. Epstein asked John Lennon what he thought the book should be called, and Lennon suggested "Queer Jew". Lennon was later quoted as saying that the book should have been