Physics 1 Problem Solutions 11

Physics 1 Problem Solutions 11 - Chapt. 1 Quantities,...

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Unformatted text preview: Chapt. 1 Quantities, Units, Conversions, Measurement, Significant Figures, and Uncertainties 7 a) 3 . 0111 10 2 and 3 . 311 10 1 . b) 3 . 01 10 2 and 3 . 311 10 1 . c) 3 . 0111 10 2 and 3 . 3 10 1 . d) 3 . 01 10 2 and 3 . 3 10 1 . e) 3 . 10 2 and 3 . 10 1 . 001 qmult 00892 1 1 3 easy memory: world commercial power usage 45. Heres a Fermi problem. What is the total commercial power (i.e., energy per unit time) used in the world to order of magnitude or so? HINT: There are about 7 10 9 people on Earth. Power in MKS units is measured in watts (W) which are joules per second. A 100-watt light bulb uses 100 W. a) 10 5 W. b) 10 7 W. c) 10 13 W. d) 10 20 W. e) 10 24 W. 001 qmult 01100 1 1 3 easy math: experimentally measuring 46. To determine experimentally: a) convert miles per hour into meters per second. b) measure the ratio of the circle area to circle circumference....
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