During the May Day holiday, Xiaoming and his family went to go on road trip. The thermal efficiency of the automobile engine is 40% when the automobile runs in a straight line at a constant speed on t

During the May Day holiday, Xiaoming and his family went to go on road trip. The thermal efficiency of the automobile engine is 40% when the automobile runs in a straight line at a constant speed on the expressway. The heat released by (1) is q = 3×107× 2.5 = 7.5×107j.

(2) During the whole driving process, the work done by the car w = fs = 7.5×107× 40% = 3×107j.

Therefore, the distance traveled by the car is s = w ÷ f = 3×107 ÷1500 = 2×104m.

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