What tool is used to calculate volume

Write a paragraph at least 10 sentences explaining how rocks are used today in society

How many grams of mgbr2 are needed to produce 75g or metal?

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