Answer:
26.8 %
Explanation:
TH = 100°C = 100 + 273 = 373 K
Tc = 0°C = 273 K
The efficiency of the heat engine is given by


η = 0.268
η = 26.8 %
Thus, the efficiency of the heat engine is 26.8 %.
The line on the graph would be constant if the speed stays the same throughout the entire time
Force bc it says the ability to make stuff happen
I think the answer is B ( matter )