15_Chapter 16 HomeworkCH16 Electrical Energy and Capacitance

15_Chapter 16 HomeworkCH16 Electrical Energy and...

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Electrical Energy and Capacitance 49 (c) () ( ) 12 11 3.74 10 F 20.0 V 7.47 10 C 74.7 pC V −− =∆= × = × = QC on one plate and 74.7 pC on the other plate. 16.26 0 A C d = , so ( )( ) 12 2 2 12 2 9 0 -15 8.85 10 C N m 21.0 10 m 3.10 10 m 60.0 10 F A d C ×⋅ × == × 9 -10 1 Å m 31.0 3.10 10 Å 10 m  =   d 16.27 (a) ( )( ) ( ) 12 3 12 2 2 4 2 00 400 10 C 1.00 10 m 90.4 V 8.85 10 C N m 5.00 10 m QQ Q d V CA dA ×× ∆= = = = = ∈∈×⋅ × (b) 4 -3 90.4 V 9.04 10 V m 1.00 10 m V E d × 16.28 0 cos15.0 or cos15.0 y mg FT m g T Σ=⇒ ° = = ° sin15.0 tan15.0 x Fq E T m g = ° = ° or tan15.0 mg E q ° = tan15.0 mgd VE d q ° ( ) ( )( ) 62 9 350 10 kg 9.80 m s 0.040 0 m tan1 30.0 10 C
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