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Determine the number o moles of ions/atoms/particle in the following: 2.50 miles of k2s (let me know how to do)

The grooves or folds of the brain are called

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!