What does the word quantum mean?

Which of the following is not a part of the respiratory system? a. pharynx b. trachea c. pancreas d. larynx

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

The voltage applied across a given parallel-plate capacitor is doubled. how is the energy stored in the capacitor affected?