Two identical tuning forks vibrate at 256 hz. one of them is then loaded with a drop of wax, after which 6 beats per second are heard. the frequency of the loaded tuning fork is a) 250 hz b) 253 hz c) 256 hz d) 259 hz e) 262 hz

When the displacement of a mass on a spring is 12a the half of the amplitude, what fraction of the mechanical energy is kinetic energy? at what displacement, as a fraction of a, is the mechanical energy half kinetic and half potential?