What is an apparent change in the frequency of sound or light waves known as?

Apiano tuner uses a tuner to create a tone of 5.00 x 10² hz. when a key on the piano is struck he hears 5 beats per second. what is a possible frequency of vibration for the piano string? 2500 hz 1300 hz 605 hz 495 hz

Acompound machine is also called a machine. a. force b. simple c. complex d. directional

Determine el momento angular de un rueda de 3000g moviendose a 10m/s con un radio de giro de 400cm