When electricity encircles an iron core a magnetic field is formed. Why is this phenomenon true?

In a system, when potential energy decreases, then entropy also decreases. true false

Aman throws a football straight into the air. as it rises, it slows down. which type of energy is the football gaining?

Abag of potato chips contains 2.00 l of air when it is sealed at sea level at a pressure of 1.00 atm and a temperature of 20.0 deg c. what will be the volume of the air in the bag if you take it with you, still sealed, to the mountains where the temperature is 7.00 deg c and atmospheric pressure is 70.0 kpa? assume that the bag behaves like a balloon and that the air in the bag is in thermal equilibrium with the outside air.