Recent content by M9501

Homework Statement The electrical energy supplied to a heater can be turned with 100% efficiency into thermal energy (room heating).Assume you use a heat pump with a COP of 4 instead to reach the same temperature increase in the room.How much electrical energy will you save ? Homework...

got it thanks K.E=5/2 KT

Homework Statement The average kinetic energy of a nitrogen molecule at temperature 25c is _____ . Select the correct answer. 1)5*10^(-21) J 2)3*10^(-20) J 3)1*10^(-20) J 4)9*10^(-20) J 5)8*10^(-21) J (i guess they are all wrong ) Homework Equations KE=3/2 K.TThe Attempt at a Solution...