Perpetual motion limits

Their data translated into a power output of lOOW/kg. Where was the power coming from Was this finally an illimitable source of energy, nature s own perpetual-motion machine It was here that Einstein, in a concise phrase, carried the argument to its limit. In his own derivation of = mcr in 1905, five years after Poincare s observation, he remarked that any body emitting radiation should lose weight. 

THEORETICAL LIMITS ON PERPETUAL MOTION KELVIN S AND CLAUSIUS PRINCIPLES... 

We see evidence that the universe tends toward highest entropy many places in our lives. A campfire is an example of entropy. The solid wood bums and becomes ash, smoke, and gases, all of which are more disordered than the solid fuel. For isolated systems, entropy never decreases. This fact has several important consequences in science it prohibits perpetual motion machines, it implies that the arrow of entropy has the same direction as the arrow of time, and so on. Increases in entropy corresponds to irreversible changes in a system, because some energy is expended as waste heat, limiting the amount of work a system can do. 

Uses. — Radium compounds find a limited use in such instruments as the spinthariscope, Fig. 6, and Strutt s radium clock. The latter is an electroscope so arranged that the leaves are alternately charged by radium and discharged by grounding. It is a curious contrivance which transforms the radiating energy of radium into motion which approaches perpetual. (SeeFig. 7.)... 

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