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24_Chapter 16 HomeworkCH17 Current and Resistance

24_Chapter 16 HomeworkCH17 Current and Resistance - 92...

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92 CHAPTER 17 17.55 (a) From ( ) V I = ∆ , the current is 3 8.00 10 W 667 A 12.0 V I V × = = = P (b) The time before the stored energy is depleted is 7 3 3 2.00 10 J 2.50 10 s 8.00 10 J s storage E t × = = = × × P Thus, the distance traveled is ( ) ( ) 3 4 20.0 m s 2.50 10 s 5.00 10 m 50.0 km d v t = = × = × = 17.56 The volume of aluminum available is 3 5 3 3 3 115 10 kg 4.26 10 m 2.70 10 kg m mass V density × = = = × × (a) For a cylinder whose height equals the diameter, the volume is 2 3 4 4 d d V d π π = = and the diameter is ( ) 1 3 5 3 1 3 4 4.26 10 m 4 0.037 85 m V d π π × = = =
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