An escalator carries you from one level to the next in an airport terminal. the upper level is 4.3 m above the lower level, and the length of the escalator is 7.5 m . assume that your mass is 64 kg . you may want to review ( pages 289 - 292) . part a how much work does the up escalator do on you when you ride it from the lower level to the upper level?

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.