Certain materials can become superconductors under what conditions? a. when it is very hot c. under very high pressure b. when it is very cold d. under very low pressure select the best answer from the choices provided a b c d

Can anybody me with this? ? (picture included.)

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.

What are the north and south poles of a solenoid change with?