Correct answer only !

the hum (sound wave) you may have heard from a transformer has a frequency of about 100 hz and a wavelength of 3.4 m. how fast does the hum travel?

remember that v= λ ∙ f

The key to stability is feedback between the reservoir and the fluxes into and/or out of the reservoir. assume that the rate of outflow from a reservoir depends on the size of the reservoir according to the following relationship: outflow rate= k x (size of reservoir), where k is a constant. a reservoir of water has a volume of 5000 liters, and the rate of outflow at steady state is 25 liters per minute. what is k? (give both the numerical value and its units.) what is the residence time? what is the relationship between k and the residence time?

You've already seen the value of 9.8 in this lesson. what's this value called? what quantity does it represent?

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