Which of the following must be happening if an object is in uniform circular motion?
A. The objects speed must be changing
B. the objects centripetal acceleration must be changing
C. the objects velocity must be changing
D. the objects must be moving in a straight line

Acar moves a distance of 50.0 km west, followed by a distance of 64.9 km north what was the magnitude of the displacement of the car, in units of kilometers?

Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?

How can waves travel through ground?