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Why should seat belts not be mandatory quick plz

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final

What characteristics of hv2112 make it the best candidate to be classified as a thorne-zytkow object?