100 POINTS!!! Two cars A and B go along intersecting paths AK and BP with velocities v1 and v2. Plot the minimum distance separating the cars.

Which is not a source of noise pollution? a)airplanes b)acid rain c)machines d)cars

The percent efficiency of a machine can never be 100% (or greater), because in the real world some energy is always converted into a. heat b. work c. input force d. output force

From center station, a train departs every 30 minutes on the fast line and a train departs every 50 minutes on the state line. if two trains depart from center station at 8: 00 a.m., one on each of the two lines, what is the next time that two trains, one on each line, will depart at the same time?