The power, in watts, dissipated as heat in a resistor varies jointly with the resistance, in ohms, and the square of the current, in amperes. A 45-ohm resistor carrying a current of 1 ampere dissipates 45 watts. How much power is dissipated in a 40-ohm resistor carrying a current of 2 amperes?
?
A. ?
B. ?
C. ?
D. 
E. ?
Answer: D
Mathematics
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A. 
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