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Tpy6a [65]
4 years ago
15

The chart below shows the amount of coal mined in four different states of USA in the year 2005.

Physics
2 answers:
qwelly [4]4 years ago
8 0

<u><em>Answer:</em></u>

The answer is <u><em>Montana...</em></u>

<u><em>Explanation:</em></u>

<u><em>Because it says 120 coal are mined in 2005...</em></u>

<u><em>So, thats why Montana is it...</em></u>

Hope this helps.....


ozzi4 years ago
3 0
The correct answer is <span>Montana.

In fact, we see from the table that Montana is the state with the largest amount of coal mined in 2005: 120 billion tons, while all the other states have a smaller amount of coal mined (37, 68 and 78, for West Virginia, Wyoming and Illinois, respectively).</span>
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The given data is incomplete. The complete question is as follows.

At an accident scene on a level road, investigators measure a car's skid mark to be 84 m long. It was a rainy day and the coefficient of friction was estimated to be 0.36.  Use these data to determine the speed of the car when the driver slammed on (and locked) the brakes. (why does the car's mass not matter?)

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Let us assume that v is the final velocity and u is the initial velocity of the car. Let s be the skid marks and \mu be the friction coefficient and m be the mass of car.

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According to Newton's law of second motion the expression for acceleration is as follows.

                      F = ma

                 -\mu N = ma

                 -\mu mg = ma

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               v^{2} = u^{2} + 2as

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                  u^{2} = 2(\mu g)s

                            = \sqrt{2(0.36)(9.81 m/s^{2})(84 m)}

                            = 24.36 m/s

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