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Some clocks that are powered by an AC voltage use the AC frequencyto keep time. The power company makes this possible by arranging to have precisely the correct number of cycles occur every day, whichkeeps such clocks from gaining or losing time over long periods.

a) How many cycles of AC voltage are there each week in the United States?

b) Suppose a clock designed for the United States (where the ACfrequency is 60 Hz) is taken to a different country where thefrequency is 55 Hz. After one fullweek at its new location, this clockwill be in error by an amount Δt. FindΔt.

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