Here is some Pawn Shop math for you.
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The melted bar of gold is worth $24,000. As part of a ship wreck, its retail or potential auction value is $48,000. Rick paid $35,000 for it, and will tag it for sale in his store at $48,000. That means the low wholesale price for it is $35,000.
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As a Pawn Shop discount store, he will negotiate the price with a buyer. I bet that he is willing to negotiate down to $40,000, which hence determines that price as the low retail price of the gold.
Proving the Relativistic Energy-Momentum relation, the hard way and the easier way.
This adds the proof for the relativistic mass effects from motion, proving that gravity causes it.
Two reference frames in motions are not symmetrical. A system at rest on the surface of a planet moves faster in time than a moving system. This is not the case using just Special Relativity. This is proven just using the gravitational metric field in General Relativity.
