Mechanical energy swing because of the work done by the pendulum to oppose these non-conservative forces. That the loss of mechanical energy in a system always resulted in an increase of the system's temperature has been known for a long time, but it was the amateur physicist James Prescott Joule who first experimentally demonstrated how a certain amount of work done against friction resulted in a definite quantity of heat which should be conceived as the random motions of the particles that comprise matter. This equivalence between mechanical energy and heat is especially important when considering colliding objects. In an elastic collision,
Homosexuality: A Psychoanalytic Study of Male Homosexuals are consistent with those of Bieber's work. They maintain that Bell "et al."′s finding that "detached-hostile father" is relatively characteristic of 52% of the white homosexual men in their study and 37% of white heterosexual men is quite similar to what was reported by Bieber "et al". The philosopher Timothy F. Murphy described Bieber "et al."′s research methodology as flawed. William Spurlin suggested that "Homosexuality" informed stereotypes later promulgated by the media. Homosexuality: A Psychoanalytic Study of Male Homosexuals Homosexuality: A Psychoanalytic Study of Male Homosexuals is a 1962 book about the development of male homosexuality by the psychoanalyst Irving