is the process in which light energy is transformed into food energy. A. life B. photosynthesis C. abiotic D. biotic

Hey guys so i need to know what is _nh3+> nh4oh ~chemistry~

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

What are several ways to reduce the effect of friction