Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 16 - Think and Discuss: 97

Answer

By typing "square meters to square feet" into a search engine, or by using the conversion factor 2.54 cm = 1 inch, and remembering there are 12 inches to a foot, we find that 1 square meter = 10.8 square feet. Assuming that one square meter at Earth's surface receives 1.0 kW = 1000 W of solar power, one square foot receives (1000 W)/(10.8) = 93 W, which is approximately equal to the output of a 100-W bulb.
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