A lightning flash transfers 4.9 M.J of energy and 6.0 C of charge to the Earth.

Question

A lightning flash transfers 4.9 M.J of energy and 6.0 C of charge to the Earth. Part A Across what potential difference did it travel? Express your answer to two significant figures and include the appropriate units. AV atue Units Submit Request Answer Part B How much water could this boil and vaporize, starting from the temperature of 20° C? The specific heat of water is 4186 J/(kg. Co) and heat of vaporization is 2260 kJ/kg. Express your answer to two significant figures and include the appropriate units. malu Units Submit Request Answer

Explanation / Answer

Apply conservation of energy

W= q del V

del V = W/q

=4.9* 10^6 J/6C

=8..16 * 10^5 V

(b)

Q= mc del T + mLV

m = Q/c del T + LV

= 4.9* 10^6/4186(100-20) + 22.6* 10^5

=1.88 kg

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