Acar is traveling around a circular race track at 180 kmh−1. if a single lap of the track is 2.4 km long, what is the angular velocity of the car (in rad s−1)?

Two large, flat, horizontally oriented plates are parallel to each other, a distance d apart. half way betwween the two plates the electric field has magnitude e. if the separation of the plates is reduced to d/2 what is the magnitude of the electric field half way between the plates?

What happens to light waves from a star as the star moves away from earth?

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?