All the waves that are around us have similar properties. One type of wave is a (4) wave, which moves perpendicular to the direction of the wave. Each wave has a specific (5), or a measured distance from one point to the same point on the wave. This property is usually measured from one (6) to the other, or from the highest point to the next highest point. It could also be measured from one lowest point, or (7), to the next lowest point. If you want to know how high the wave is, you should measure the (8) from the rest position to the crest or to the trough.

Your starship, the aimless wanderer, lands on the mysterious planet mongo. as chief scientist-engineer, you make the following measurements: a 2.50-kg stone thrown upward from the ground at 14.0 m/s returns to the ground in 5.70 s ; the circumference of mongo at the equator is 2.20×10^5 km ; and there is no appreciable atmosphere on mongo. (a) the starship commander, captain confusion, asks for the following information: what is the mass of mongo? (b) if the aimless wanderer goes into a circular orbit 2.20×10^4 km above the surface of mongo, how many hours will it take the ship to complete one orbit? (c) an unmanned spacecraft is in a circular orbit around the moon, observing the lunar surface from an altitude of 44.0 km . to the dismay of scientists on earth, an electrical fault causes an on-board thruster to fire, decreasing the speed of the spacecraft by 23.0 m/s . if nothing is done to correct its orbit, with what speed (in km/h) will the spacecraft crash into the lunar surface?