Which of the following is a physical change? adding acid to milk to form sour cream, adding enzymes to milk to form cheese, adding bacteria to heated milk to form yogurt, adding sugar to milk to form sweetened milk

Explain the doppler effect in terms of frequency, wavelength, and speed.

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.

What distance does a car travel as its speed changes from 0 to 20 m/s in 17 s at constant acceleration?