27_Chapter 21 HomeworkCH21 Alternating Current Circuits and Electromagnetic Waves

# 27_Chapter 21 HomeworkCH21 Alternating Current Circuits and Electromagnetic Waves

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Alternating Current Circuits and Electromagnetic Waves 227 21.57 () DC DC 12.0 V 19.0 0.630 A V R I === 2 2 rms rms 24.0 V 2 42.1 0.570 A V ZR f L I π =+ = = =Ω Thus, 22 2 42.1 19.0 9.96 10 H 99.6 mH 2 2 60.0 Hz L f ππ Ω− == = × = 21.58 Suppose you cover a 1.7 m-by-0.3 m section of beach blanket. Suppose the elevation angle of the Sun is 60°. Then the target area you fill in the Sun’s field of view is ( )( ) 2 1.7 m 0.3 m cos30 0.4 m °= . The intensity the radiation at Earth’s surface is surface incoming 0.6 II = and only 50% of this is absorbed. Since ( ) av Et I A A ∆∆ P , the absorbed energy is ( ) ( ) surface incoming 0.5 0.5 0.6 0.5 0.6
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