Abird is placed in a chamber with two pecking keys. the green one provides food on a vi60 sec (variable interval of 60 seconds) schedule and the yellow key provides food on a vi180 sec schedule. according to the matching law, what is the percentage of time the bird pecks the green key?

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.