Final answer:
The calorific values for the given fuels are as follows: A) Gasoline - 115,000 Btu/cu ft, B) Diesel - 140,000 Btu/cu ft, C) Ethanol - 76,000 Btu/cu ft, and D) Methane - 1,000 Btu/cu ft.
Step-by-step explanation:
The calorific value, also known as the heat of combustion, indicates the amount of heat energy produced when a certain amount of fuel is burned. It is typically measured in British thermal units per cubic foot (Btu/cu ft) or joules per cubic meter (J/m^3). Here are the calorific values for the given fuels:
- A) Gasoline: The calorific value of gasoline is approximately 115,000 Btu/cu ft.
- B) Diesel: The calorific value of diesel is around 140,000 Btu/cu ft.
- C) Ethanol: The calorific value of ethanol is approximately 76,000 Btu/cu ft.
- D) Methane: The calorific value of methane is about 1,000 Btu/cu ft.