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miskamm [114]
4 years ago
7

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 ga

llon of gasoline contains 120 MJ, approximately how many gallons of gasoline would be required
Physics
1 answer:
mash [69]4 years ago
8 0

Answer:

30[gal] would be requiered.

Explanation:

The consumption ratio is given by the following expression:

\frac{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.

\frac{3.6[MJ]}{[1 pass-km]}*1[pass-1000km]\\\\ = 3600[MJ]

1 gal = 120 [MJ]

  x    = 3600[MJ]

x = 30 [gal]

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Answer:

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Explanation:

Given,

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The time taken by the object to travel is, t = 5 s

Using the first equation of motion

                               <em>v = u + at</em>

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                                a = (10 - 15) / 5

                                    = -1 m/s²

The negative sign indicates the body is decelerating

The acceleration of the object is, a = -1 m/s²

The speed of the object after 2 seconds

From the above equations of motion

                                  v = 15 + (-1) 2

                                     = 12 m/s

Hence, the speed of the object after 2 seconds is, v = 12 m/s

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Answer:

Explanation:

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