The temperature coefficient of resistivity of platinum is 3.9*10^ -3 ^ C . If a platinum wire has a esistance of Rat room temperature (23 degrees * C) , to what temperature must it be heated in order to double its resistance to 2R?​

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.