While spinning at 50 rad/s, a solid uniform disk has a rotational kinetic energy of 4.5 kJ. If the radius of the disk is 1.3 m, what is its mass, in kg?

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

Astone dropped into a well is heard to strike the water after 8seconds. find the depth of the well if the velocity of sound is 350m/s

You are traveling in a car going at a constant speed of 100km/h down a long, straight highway. you pass another car going in the same direction which is traveling at a constant speed of 80km/h. as measured from your car's reference frame this other car is traveling at −20km/h. what is the acceleration of your car as measured from the other car's reference frame? what is the acceleration of the other car as measured from your car's reference frame?