How practical is solar power for various devices?
Assume that on a sunny day, sunlight has an intensity of 1000 W/m2 at the surface of Earth and that, when illuminated by that sunlight, a solar-cell panel can convert 10% of the sunlight’s energy into electric power. For each device given below, calculate the area A of solar panel needed to power it. (a) A calculator consumes 50 mW. Find A in cm2. Is A small enough so that the solar panel can be mounted directly on the calculator that it is powering? (b) A hair dryer consumes 1500 W. Find A in m2. Assuming no other electronic devices are operating within a house at the same time, is A small enough so that the hair dryer can be powered by a solar panel mounted on the house’s roof? (c) A car requires 20 hp for highway driving at constant velocity (this car would perform poorly in situations requiring acceleration). Find A in m2. Is A small enough so that this solar panel can he mounted directly on the car and power it in “real time”?
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Chapter 31 Solutions
PHYSICS FOR SCIEN & ENGNR W/MOD MAST
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- A maser is a laser-type device thatproduces electromagnetic waves with frequencies in the microwaveand radio-wave bands of the electromagnetic spectrum. You can use theradio waves generated by a hydrogen maser as a standard of frequency.The frequency of these waves is 1,420,405,751.786 hertz. (A hertz is anothername for one cycle per second.) A clock controlled by a hydrogenmaser is off by only 1 s in 100,000 years. For the following questions,use only three significant figures. (The large number of significant figuresgiven for the frequency simply illustrates the remarkable accuracyto which it has been measured.) How many cycles occur in 1 h?arrow_forwardA maser is a laser-type device thatproduces electromagnetic waves with frequencies in the microwaveand radio-wave bands of the electromagnetic spectrum. You can use theradio waves generated by a hydrogen maser as a standard of frequency.The frequency of these waves is 1,420,405,751.786 hertz. (A hertz is anothername for one cycle per second.) A clock controlled by a hydrogenmaser is off by only 1 s in 100,000 years. For the following questions,use only three significant figures. (The large number of significant figuresgiven for the frequency simply illustrates the remarkable accuracyto which it has been measured.) By how many seconds would a hydrogen maser clock be off after a time interval equal to the age of the earth?arrow_forwardA maser is a laser-type device thatproduces electromagnetic waves with frequencies in the microwaveand radio-wave bands of the electromagnetic spectrum. You can use theradio waves generated by a hydrogen maser as a standard of frequency.The frequency of these waves is 1,420,405,751.786 hertz. (A hertz is anothername for one cycle per second.) A clock controlled by a hydrogenmaser is off by only 1 s in 100,000 years. For the following questions,use only three significant figures. (The large number of significant figuresgiven for the frequency simply illustrates the remarkable accuracyto which it has been measured.) What is the time for one cycle of the radio wave?arrow_forward
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- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage LearningAn Introduction to Physical SciencePhysicsISBN:9781305079137Author:James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar TorresPublisher:Cengage Learning
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