Please answer 37, 40,46, 47 37. In a lightning strike lasting 45 ms, a total cha

Question

Please answer 37, 40,46, 47

37. In a lightning strike lasting 45 ms, a total charge of 350 C is transferred to the ground. What is the current during the lightning strike? 40. Find the resistance between two ends of an aluminum wire 0.25 m long and 1.0 cm in diameter. (For aluminum p-2.75x10 Qm). 46. A 12.0 V battery produces 230 mA when connected across a 50.0 ? load. A) what is the battery's internal resistance? B) Find the potential difference across the battery's terminals. 47, when an 18.0 V battery is connected across a 130 ? load the potential difference across the terminals is 17.4 V. What's the internal resistance?

Explanation / Answer

37) I = Q/t

I = 350 / 0.045 = 7777.78 A

40 ) R = pL/A

R = 2.75*10^-8 * 0.25 / pi*0.005^2

= 8.75*10^-5 ohm

46) V = E - IR

0.23*r = 12 - 0.23*50

r = 2.17 ohm

B) Potential difference = Ir = 0.23*2.17 = 0.5 V

47) V = E - IR

17.4 = 18 - I*130

I = 0.0046 A

V = Ir

r = 17.4/0.0046 = 3770 ohm

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