Question

The energy used in a 100 kilometres car trip is about 15 kWh. Assuming that the energy content of the fuel is 10 kWh/litre and the efficiency of the engine is 33 %, how many litres of fuel are needed for a 100 kilometres car trip? Choose the best alternative.


5 litres


7.5 litres


15 litres


10 litres

Answer 1

Answer:

Step-by-step explanation:

The energy used for a 100 kilometer trip is 15 kWh and the energy content of the fuel is 10 kWh/liter. To find the amount of fuel required, we can divide the energy used by the energy content of the fuel:

15 kWh / 10 kWh/liter = 1.5 liters

However, the engine efficiency is only 33%, so the actual amount of fuel consumed would be higher. To account for the engine efficiency, we can divide the fuel required by the efficiency:

1.5 liters / 0.33 = 4.5 liters

So, 4.5 liters of fuel would be needed for a 100 kilometer trip with an engine efficiency of 33%.

Answer 2

Answer:

With a 33% engine efficiency, 4.5 litres of gasoline would be required for a 100-kilometer journey.

Step-by-step explanation:

The energy used for a 100-kilometer trip is 15 kWh and the energy content of the fuel is 10 kWh/liter. To find the amount of fuel required, we can divide the energy used by the energy content of the fuel:

= 15/10  = 1.5 liters

However, the engine efficiency is only 33%, so the actual amount of fuel consumed would be higher. To account for the engine efficiency, we can divide the fuel required by the efficiency:

1.5 liters / 0.33 = 4.5 liters

So, With a 33% engine efficiency, 4.5 litres of gasoline would be required for a 100-kilometer journey.

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