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3 years ago

Determine the kinetic energy of a 100-kg roller coaster car that is moving with a speed of 20.0/ms.

Mathematics

1 answer:

rjkz [21]3 years ago

3 0

Answer:

The kinetic energy is 20,000\ J

Step-by-step explanation:

The kinetic energy of a body is defined as:

$k = \frac{1}{2}ms ^ 2$

Where <em>m</em> is the mass of the roller coaster car

<em>s</em> is the speed and <em>k</em> is the kinetic energy

We know that $s = 20\ m/s$

$m = 100\ kg$

Then the kinetic energy of the roller coaster car is:

$k = \frac{1}{2}(100)(20) ^ 2\\\\k = 50(20) ^ 2\\\\k = 50 * 400\\\\k = 20,000\ J$

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vlabodo [156]

Answer:

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Step-by-step explanation:

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If two samples A and B had the same mean and standard deviation, but sample A had a larger sample size, which sample would have

Advocard [28]

<h3>Answer: Sample B as it has the smaller sample (choice #4)</h3>

===========================================================

Explanation:

Recall that the margin of error (MOE) is defined as

MOE = z*s/sqrt(n)

The sample size n is located in the denominator, meaning that as n gets bigger, the MOE gets smaller. The same happens in reverse: as n gets smaller, the MOE gets bigger.

Put another way, a small sample size means we have more error because small samples mean they are less representative of the population at large. The bigger a sample is, the better estimate we will have of the parameter.

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3 years ago

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Irina-Kira [14]

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Answer:

x ≥ 7
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Step-by-step explanation:

You have to realize that the absolute value function will change the sign of its argument only if that argument is negative.

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3 years ago

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Step-by-step explanation:

Arranging the terms;

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3 years ago

The data set represents the total number of pencils each student in a class needs to sharpen.

Firdavs [7]

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The correct statement that represents the box plot of the data correctly.

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