No, no one has ever created a PPM despite many claims. The US actually put a block on copyright claims for PPM, as they believed it wasn't possible. They aren't possible as they violate either the...
Short answer: No. Thermodynamically, the entropy, or level of disorder, of a system must always increase for a physical system as it moves or changes. In practical terms, this means that no system is...
if planetary motion is to be considered perpetual , then the answer is yes. Bcoz usage of gravity determined by the temperature of sun and the planet respectively keeps them in motion . similarly...