An open system starts with 52 J of mechanical energy. The energy changes to 45 J of mechanical energy and 2 J of thermal energy. What is the final total
energy of the system?
O A. 473
B. 50 J
C. 54 J
D. 9 J

Ten students stand in a circle and are told to make a transverse wave. what best describes the motion of the students? each student bumps the shoulder of his or her neighbor. at the exact time, all students take a step to the right. the students skip clockwise, going in a circular motion. one at a time, each student lifts his or her hands up and then down.

Which is not an example of how an object gains elastic potential energy by stretching? a. jumping on a pogo stick b. pulling on a rubber band c. jumping on a trampoline

4.4 cm3 of water is boiled at atmospheric pressure to become 1972.7 cm3 of steam, also at atmospheric pressure. calculate the work done by the gas during this process. the latent heat of vaporization of water is 2.26 × 106 j/kg . answer in units of j.