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Chapter 16: Q7PE (page 590)
What is the period of 60 Hz electrical power?
The time period of 60 Hz electrical power is 0.017 s.
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A car has two horns, one emitting a frequency of 199 Hz and the other emitting a frequency of 203 Hz. What beat frequency do they produce?
Why are soldiers in general ordered to “route step” (walk out of step) across a bridge?
(a) A photovoltaic array of (solar cells) is 10.0% efficient in gathering solar energy and converting it to electricity. If the average intensity of sunlight on one day is 700 W/m2, what area should your array have to gather energy at the rate of 100W? (b) What is the maximum cost of the array if it must pay for itself in two years of operation averaging 10.0 hr per day? Assume that it earns money at the rate of 9.00C per kilowatt-hour.
(a) What is the intensity in W/m2 of a laser beam used to burn away cancerous tissue that, when 90.0% absorbed, puts 500 J of energy into a circular spot 2.00 mm in diameter in 4.00 s?
(b) Discuss how this intensity compares to the average intensity of sunlight (about 700 W/m2) and the implications that would have if the laser beam entered your eye. Note how your answer depends on the time duration of the exposure.
Give an example of a damped harmonic oscillator. (They are more common than undamped or simple harmonic oscillators.)
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