Posted by Machelle Butts on Tuesday, February 16, 2010 at 3:40pm.
Electrical energy in
= (V^2/R)*time (in Joules)
(use time = 540 seconds)
All of this energy is converted to heat, Q.
The electrical energy required is
Q = M C *(delta T)
= 2000 g*[4.186 J/(deg C*g)]*40 C
Use those two equations to solve for R.
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