Physics

posted by Es

During a particular thunderstorm, the elctric potential difference between the clouds and the groud is Vcloud-Vgroud = 10^9 volts with the cloud being at the higher potential. Now, there is a lightning flash in which a charge of -25C is transferred from the ground to the cloud.

a) how much work is done on the charge by the electric force?

b) if the work done by the elctricforce were instead used to acclerate a 1100kg automobile from rest, what would be its final speed?

c) if the work done were converted to heat, how many kiligrams of water at room temperature could be vaporized?

I know that the heat energy required to vaporize a certain mass of water is Q=cm deltaT + mL. the specific heat capacity of water at room temperature is apporximately c=4186J/(kgxC). The latent heatof vaporization of water is L = 22.6x10^5J/kg. The temperature change is deltaT = (100-20)C

Please help!!!

  1. bobpursley

    Nuts to your I know paragraph. This has nothing to do with water heating. It has to do with electrical forces and energy.

    Work= Volts*chargetrnasfered
    b. 1/2 m v^2= work done by electicity
    c. Now use the heat you pointed out.

    Electrical work= heat to heat water+ heat to make steam. Solve for the mass water/steam

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