Question

The energy expenditure value of traveling by car is 3.6 MJ/passenger-kilometer. For one person making a trip of 1000 km, if a gallon of gasoline contains 120 MJ, approximately how many gallons of gasoline would be required

Answer 1

30[gal] would be requiered.

Step-by-step explanation:

The consumption ratio is given by the following expression:

`(3.6[MJ])/([1pass-km])`

To find the amount of energy needed we must multiply the ratio by the number of passengers, in this way the unit passenger-kilometer is removed from the denominator.

`(3.6[MJ])/([1 pass-km])*1[pass-1000km]\\\\ = 3600[MJ]`

1 gal = 120 [MJ]

x = 3600[MJ]

x = 30 [gal]