A1056-hertz tuning fork is struck at the same time as a note on the piano and you hear 2 beats/second. you tighten the piano string very slightly and then hear 3 beats/second. what is the frequency of the piano string?

What happens when a rubber rod is rubbed with a piece of fur?

Two loudspeakers, 5.5 m apart and facing each other, play identical sounds of the same frequency. you stand halfway between them, where there is a maximum of sound intensity. moving from this point toward one of the speakers, you encounter a minimum of sound intensity when you have moved 0.33 m . assume the speed of sound is 340 m/s. part a) what is the frequency of the sound? part b) if the frequency is then increased while you remain 0.21 m from the center, what is the first frequency for which that location will be a maximum of sound intensity? express your answer to two significant figures and include the appropriate units.

The force it would take to accelerate an 900-kg car at the rate of 6m/s2