30_Ch 21 College Physics ProblemCH21 Alternating Current Circuits and Electromagnetic Waves

30_Ch 21 College Physics ProblemCH21 Alternating Current Circuits and Electromagnetic Waves

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230 CHAPTER 21 (b) DC DC 12 V 4.0 3.0 A V I = R == From () 2 22 2 2 L ZRX R f L π =+=+ , we find 2 6.0 4.0 1.2 10 H 12 mH 6 0 H z ZR L f ππ Ω− = × = 21.65 (a) The radiation pressure on the perfectly reflecting sail is ( ) ( ) 2 62 8 21340 Wm 2 8.93 10 N m 3.00 10 m s Intensity p c = × × so the total force on the sail is ( )( ) 4 2 8.93 10 N m 6.00 10 m 0.536 N FpA =⋅ = × × = (b) 52 0.536 N 8.93 10 m s 6 000 kg F m = × a (c) From 2 0 1 2 xv t a t + ∆= , with 0 0 v = , the time is 8 6 4 23 .84 10 m 2 1 d 2.93 10 s 33.9 d 8.93 10 m s 8.64 x t a ×  = × =  ××  21.66 We know that ( ) 1, rms 1 1, rms 1, rms 11 , r m s 2 , r m s 2,rms 2 IZ VI NZ NV I Z = ()() s 1, rms 2, rms 2, rms 2 Also, for an ideal transformer,
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