(Solved): The engine of a large ship does 1.80108J of work with an efficiency of 6.00%. (a) How much heat ...

The engine of a large ship does $1.80\times 10^8\mathrm{J}$ of work with an efficiency of $6.00\%$. (a) How much heat transfer (in J) occurs to the environment? J (b) How many barrels of fuel are consumed, if each barrel produces $6.00\times 10^9\mathrm{J}$ of heat transfer when burned? barrels (b) What must the hot reservoir temperature (in degrees $\mathrm{C}$ ) be for a real heat engine that achieves 0.740 of the maximum efficiency, but still has an efficiency of $40.0\%$ (and a cold reservoir at $31,0^{\circ }\mathrm{C}$ )? ${}^{\circ }\mathrm{C}$ (c) Does your answer imply practical limits to the efficiency of car gasoline engines?