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The voltage, V , in volts, in an electrical outlet is given as a function of time, t, in seconds, by the function V = 156 cos(120πt).
(a) Give an expression for the rate of change of voltage with respect to time.
(b) Is the rate of change ever zero? Explain.
(c) What is the maximum value of the rate of change?
What is the sound intensity level at a distance of 1.0 km? Express your answer to two significant figures and include the appropriate units.
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