If your job requires you to always measure out 5.6 liters of water in each container you fill, and you mistakenly fill one with only 5.4 liters, what was the percent error of you mistake?

Astring vibrates with a frequency of 10 hz. why can't a person hear the sound waves produced by the vibrating string, no matter how large the amplitude of the waves? out! this is homework and due tomorrow! you so much!