Three guns are aimed at the center of a circle, and each fires a bullet simultaneously. the directions in which they fire are 120° apart. two of the bullets have the same mass of 4.02 x 10-3 kg and the same speed of 364 m/s. the other bullet has an unknown mass and a speed of 607 m/s. the bullets collide at the center and mash into a stationary lump. what is the unknown mass?

Light traveling in a medium with a refractive index 1.19 is incident on a plate of another medium with index of refraction 1.79. at what angle of incidence is the reflected light fully polarized?

Which sound characteristic is not affected by the relative motion of an object

At a certain instant after jumping from the airplane a, a skydiver b is in the position shown and has reached a terminal (constant) speed vb = 52 m/s. the airplane has the same constant speed va = 52 m/s, and after a period of level flight is just beginning to follow the circular path shown of radius ρa = 2330 m. (a) determine the velocity and acceleration of the airplane relative to the skydiver. (b) determine the time rate of change of the speed vr of the airplane and the radius of curvature ρr of its path, both as observed by the nonrotating skydiver.