Suppose you are at a track where 7 joggers are doing laps. their speeds are 5, 5, 4, 3, 7, 8, and 9 mph. calculate their average speed, then calculate their RMS speed

What are similarities and differences between refraction, reflection, diffraction and absorption?

This energy transformation diagram represents the energy of a skateboarder moving along a half-pipe. as she skates toward the top of the half-pipe, her original kinetic energy is converted to potential energy and friction. how much of the energy is potential?

If you wanted to move an electron from the positive to the negative terminal of the battery, how much work w would you need to do on the electron? enter your answer numerically in joules.