How much heat is required to convert solid ice with a mass of 985 g and at a temperature of -29.5 °c to liquid water at a temper
ature of 81.5 °c? (the specific heat of ice is cice = 2100 j/kgk, the specific heat of water is cwater = 4186.8 j/kgk, and the heat of fusion for water is: lf = 334 kj/kg.)?
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Answer:
E'=(3/16)E
Explanation:
The electric field generated by a Van de Graff generator can be taken as the electric field generated by a hollow shell (for distance out of the shell):
Q: electric charge
K: Coulomb's constant
R: distance in which E is measured.
If the distance is increased to R'=2R, and the charge to Q'=(4/3)Q the new electric field is:
hence, the new electric field E' is 3/16 times the previous electric field E