At a factory a noon whistle is sounding with a frequency of, Ask an Expert

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Q. An archer pulls the bowstring back for a distance of 0.47 m before releasing the arrow. The bow and string act like a spring whose spring constant is 425N/m.

(a) what is the elastic potential energy of the drawn bow?
(b) The arrow has a mass of 0.030kg. How fast is it travelling when it leaves bow?

Q. At a factory, a noon whistle is sounding with a frequency of 497 Hz. As a car traveling at 84km/h approaches the factory, driver hears the whistle at frequency fi. After driving past the factory, the driver hears frequency ff. What is the change in frequency ff - fi heard by driver?

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