The trouble is that gravity is not equally strong all over the surface of the earth, so for instance there would be nonconservation of mass when you brought an object up to the top of a mountain, wher...The trouble is that gravity is not equally strong all over the surface of the earth, so for instance there would be nonconservation of mass when you brought an object up to the top of a mountain, where gravity is a little weaker. One method would be to have undercover agents try to find out how much money goes in the door, and how much money comes back out at the end of the day, perhaps by arranging through some trick to get access to the owner's briefcase in the morning and evening.
A convenient notation used throughout physics is \(\Delta\), the uppercase Greek letter delta, which indicates “change in” or “after minus before.” For example, if \(b\) represents how much money you ...A convenient notation used throughout physics is \(\Delta\), the uppercase Greek letter delta, which indicates “change in” or “after minus before.” For example, if \(b\) represents how much money you have in the bank, then a deposit of $100 could be represented as $\Delta{}b=$100$. That is, the change in your balance was $100, or the balance after the transaction minus the balance before the transaction equals $100.
