Please help urgent How can you safely turn on and off an electromagnet on and off?

C3h8o3 - glycerol major species present when dissolved in water

Amixture with the same composition throughout is!

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