Why do atoms of different elements vary in size?

How does the viscosity of magma change as magma cools?

Light waves can move through , but they travel fastest when they move through a(n) .

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