Ireally like this guy and he is showing signs like as if he likes me but i still think he likes me as a friend. what do i do? do i tell him i like him or not because it might ruin our friendship?

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!