(b) At how many revolutions per minute is the engine rotating?ġ6.3: Simple Harmonic Motion: A Special Periodic Motionģ1. (a) How fast is a race car going if its eight-cylinder engine emits a sound of frequency 750 Hz, given that the engine makes 2000 revolutions per kilometer? What is the frequency of these vibrations if the car moves at 30.0 m/s?Įach piston of an engine makes a sharp sound every other revolution of the engine. Each crevice makes a single vibration as the tire moves.
A tire has a tread pattern with a crevice every 2.00 cm.
