A sound wave has a frequency of 400 hz and a wavelength of 20 meters what is the speed

Iflow from a warmer object to a cooler object until both objects are the same temperature what am i?

Which of these has some mechanical energy? a. an atom b. heat inside earth c. a book on a shelf d. the fire from a lit match

The basketball coach tells his team to run sprints back and forth across the court, which is 30 m long. they start at the left end of the court, run back and forth 6 times, then end back at the left end of the court where they began. what distance did they run? what is their displacement?