Precalculus Examples

$75 \frac{rev}{\min}$

Step 1

Use the fact that each revolution is $2 π$ radians and each minute is $60$ seconds to convert from $rpm$ to $\frac{radian}{sec}$

$\frac{75 \cdot round}{min} \cdot \frac{2 π \cdot radian}{round} \cdot \frac{min}{60 \cdot sec}$

Step 2

Cancel the common units.

$\frac{75 \cdot round}{min} \cdot \frac{2 π \cdot radian}{round} \cdot \frac{min}{60 \cdot sec}$

Step 3

Simplify the expression to find the solution in $\frac{radian}{sec}$ .

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Cancel the common factor of $75$ and $60$ .

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Factor $15$ out of $75 \cdot (2 π)$ .

$\frac{15 (5 \cdot (2 π))}{60} \cdot \frac{radian}{sec}$

Cancel the common factors.

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Factor $15$ out of $60$ .

$\frac{15 (5 \cdot (2 π))}{15 (4)} \cdot \frac{radian}{sec}$

Cancel the common factor.

$\frac{15 (5 \cdot (2 π))}{15 \cdot 4} \cdot \frac{radian}{sec}$

Rewrite the expression.

$\frac{5 \cdot (2 π)}{4} \cdot \frac{radian}{sec}$

Cancel the common factor of $2$ and $4$ .

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Factor $2$ out of $5 \cdot (2 π)$ .

$\frac{2 (5 \cdot (π))}{4} \cdot \frac{radian}{sec}$

Cancel the common factors.

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Factor $2$ out of $4$ .

$\frac{2 (5 \cdot (π))}{2 \cdot 2} \cdot \frac{radian}{sec}$

Cancel the common factor.

$\frac{2 (5 \cdot (π))}{2 \cdot 2} \cdot \frac{radian}{sec}$

Rewrite the expression.

$\frac{5 \cdot (π)}{2} \cdot \frac{radian}{sec}$

$\frac{5 π}{2} \cdot \frac{radian}{sec}$

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