A tennis player moves in a straight line path as shown in Figure 3. Find the average velocity in the in intervals.​

Oxygen undergoes an isentropic expansion from 120 degree c and 280 kpa absolute to 140 kpa absolute. determine the final temperature of the oxygen and the amount of work per kg of o_2 produced in the process if it is adiabatic.

Herman is walking his pet fish, leo , back and forth along the canal. suppose the canal is 30 meters long and he goes up and back 25 times. a) what distance has herman walked?

5. why should the electrons be placed separate from each other (why not together)?