H 0-19 points 0310110/4 Submissions Used My Notes During a lightning flash, ther

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H 0-19 points 0310110/4 Submissions Used My Notes During a lightning flash, there exists a potential difference of Vcloud Vground 2.3 x 109 V between a cloud and the ground. As a result, a charge of-22 C is transferred from the ground to the cloud. (a) How much work Wground-cloud is done on the charge by the electric force? Select (b) If the work done by the electric force were used to accelerate a 1100- kg automobile from rest, what would be its final speed? -Select- (c) If the work done by the electric force were converted into heat, how many kilograms of water at 0°C could be heated to 100°C? wground-cloud- 1-Select- GO Tutorial Additional Materials Section 19.2

Explanation / Answer

Potential is defined work done per unit charge

or V = W/q

Hence, W = V x q = 2.3x109V x 22C = 5.06x1010J

b) W = change in kE

= 5.06x1010J = 1/2 mv2

Hence, v = sqrt(2 x 5.06 x 1010/1100) = 9200m/s

c) Now Q = mcT .

so m = Q/(cxT) = 5.06 x 1010/(4186x100) = 1.21x105kg

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