972_Physics ProblemsTechnical Physics

972_Physics ProblemsTechnical Physics - Chapter 34 P34.69...

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Chapter 34 313 P34.69 We take R to be the planet’s distance from its star. The planet, of radius r , presents a projected area π r 2 perpendicular to the starlight. It radiates over area 4 2 r . At steady-state, PP in out = : eI r e r T in πσ 22 4 4 ej e j = e R re r T 600 10 4 23 4 . × F H G I K J = W 4 2 e j so that 6 00 10 16 23 2 4 . ×= W RT R T = × = × ×⋅ = 6 00 10 6 00 10 310 477 10 477 23 4 23 8 4 9 .. W 16 W 16 5.67 10 W m K K m G m 24 af . ANSWERS TO EVEN PROBLEMS P34.2 (a) 2 68 10 3 . × AD; (b) 8 31 . min; (c) 2 56 . s ; P34.30 (a) 577 W m 2 ; (b) 2 06 10 16 . × W; (d) 0133 s ; (e) 33 3 . s µ (c) 68 7 . MN ; (d) The gravitational force is ~10 13 times stronger and in the opposite direction. P34.4 733 nT P34.6 Ex t =− × 300 62 8 1 88 10 10 Vm bg cos . . ; Bx t × 100 628 188 10 10 .c o s . . T P34.32 4.09° P34.34 (a) 93 3% . ; (b) 50 0% . ; (c) 0 P34.8 see the solution P34.36 2 mc eB p P34.10 2 9 10 5% 8 . ×± ms P34.38 see the solution P34.12 49 5 . mV P34.40 (a) ~10 8 Hz radio wave; P34.14 (a) 13 3 . n Jm 3 ; (b) 13 3 3 ; (b) ~10 13 Hz infrared light (c) 796 . Wm 2 P34.42 (a) 0 690 w a v e l e n g t h s ; P34.16 516 pT, ~10 5 times stronger than the Earth’s field
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