Which is the best definition of air pressure? A. the amount of water vapor in the air.

B. the weight of the air pressing on everything in the environment

C. the amount of precipitation in a certain area

D. the type of clouds in the atmosphere

In a heat engine of 1000 j of heat enters the system and the piston does 500 j of work what is the final internal energy of the system if the inital energy was 2000 j we have to do all of these down here 1)write the equation 2)list out your know variables 3)plug the numbers into the equations 4)solve 5)write your solution statemtn that includes inital energuy and final energuy added