Physics, 30.10.2019 23:31 iiomqjessica

Estimate the number of gallons of gasoline consumed by the total of all automobile drivers in the u. s., per year. suppose that there are about 3 × 10^8 people in the united states, approximately half of the them have cars, each car drives an average of 12,000 mi per year, and consumes a gallon of gasoline for each 20 mi?

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Answer from: ksspiegler

$G = 9 \times 10^{10} gallons$

Explanation:

Total number of people in US is $N_p = 3 \times 10^8$

Only half of them have cars. So, Number of cars in US

$N_C = \frac{N_p}{2} \\\\N_C = \frac{3 \times 10^8}{2} \\\\N_C = 1.5 \times 10^8$

Each cars drives 12000 miles, so total distance travelled by all of these cars combined

$D = N_C \times 12000\\\\D = 1.5 \times 10^8 \times 12000\\\\D = 1.8 \times 10^{12} miles$

To travel 20 miles, we need 1 gallon of gasoline

Amount of gasoline required to travel one mile is $\frac{1}{20}$ gallons

Amount of gasoline required to cover the distance 'D'.

$G = D \times \frac{1}{20} \\\\G = 1.8 \times 10^{12} \times \frac{1}{20} \\\\G = 9 \times 10^{10} gallons$

Amount of gasoline required to cover the distance 'D'.

$G = D \times \frac{1}{20} \\\\G = 1.8 \times 10^{12} \times \frac{1}{20} \\\\G = 9 \times 10^{10} gallons$

Answer from: Quest

object 2 because all the other ones are wrong

Answer from: Quest

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