An electric heating coil will consume 6.0*10^2 W of power when it is connected to a 120V outlet. A greenhouse operator has 2 such coils, and she wants to construct a single heater using the two coils to keep her small greenhouse at a temperature of 50.0 C during the winter months. For how many hours must this heater (2 coils) operate per day if an average of 1.5*10^7 J of energy are required each winter day to maintain the desired temperature given that the coils are connected
a) in series
b) in parallel

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