697_Physics ProblemsTechnical Physics

697_Physics ProblemsTechnical Physics - Chapter 24 P24.33...

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Chapter 24 37 P24.33 Consider two balloons of diameter 0.2 m, each with mass 1 g, hanging apart with a 0.05 m separation on the ends of strings making angles of 10° with the vertical. (a) FT m g T mg y = = ° cos cos 10 0 10 F xe e = sin sin 10 0 10 , so F mg mg F e e = ° F H G I K J °= ° ≈× −− cos sin tan . . tan 10 10 10 0 001 9 8 10 21 0 33 kg m s N ~10 N or 1 mN 2 bg ej FIG. P24.33 (b) F kq r e e = 2 2 0 899 10 025 1 2 10 10 3 92 2 77 ×≈ ×⋅ N Nm C m C ~ C or 100 nC 22 . . . af q q (c) E r e =≈ × 2 97 2 4 8 9 91 0 1 0 1 7 10 10 .. . .~ C m NC kNC e j a f (d) Φ E q = × 0 7 12 4 12 10 1 4 10 10 . C 8.85 10 C N m kNm C *P24.34 The charge density is determined by
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