1.Which situation shows heat doing work?, A. Ice melting, B. Steam turning a turbine, C. Light reflection, D. Sound echo, 2.Why does a motor become warm after long use? , A. Light energy, B. Friction and energy conversion, C. Water absorption, D. Magnetism, What happens when air is heated inside a container?, Shrinks, Freezes, Expands and pushes outward, Disappears, 4000 J of heat is added to a system and -4500 J of work is done on the system. What is the change in internal energy? , 8000J, 8250J, 8500J, 80050J, 3000 J of heat is added to a system and the system does 2000 J of work on its surroundings. Find ΔU., 1000J, 1500J.

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