Discussion
Hydrogen has a heating value near \( 120 \ \mathrm{MJ/kg} \) against kerosene's \( 43 \). The ratio is approximately
Answer: C
Dividing gives \( 120/43 \approx 2.8 \). Hydrogen's advantage per kilogram is large, but its very low density means the tank volume required is several times greater, which is a severe practical penalty on a slender vehicle.
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