Precalculus Examples

$65 r p m$

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

$\frac{65 \cdot round}{min} \cdot \frac{2 π \cdot radian}{round} \cdot \frac{min}{60 \cdot sec}$

Cancel the common units.

$\frac{65 \cdot round}{min} \cdot \frac{2 π \cdot radian}{round} \cdot \frac{min}{60 \cdot sec}$

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

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Remove parentheses around $2 π$ .

$\frac{65 \cdot 2 π}{60} \frac{radian}{sec}$

Reduce the expression by cancelling the common factors.

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Factor $5$ out of $60$ .

$\frac{5 (13 \cdot 2 π)}{5 (12)} \frac{radian}{sec}$

Cancel the common factor.

$\frac{5 (13 \cdot 2 π)}{5 \cdot 12} \frac{radian}{sec}$

Rewrite the expression.

$\frac{13 \cdot 2 π}{12} \frac{radian}{sec}$

Reduce the expression by cancelling the common factors.

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Factor $2$ out of $12$ .

$\frac{2 (13 π)}{2 \cdot 6} \frac{radian}{sec}$

Cancel the common factor.

$\frac{2 (13 π)}{2 \cdot 6} \frac{radian}{sec}$

Rewrite the expression.

$\frac{13 π}{6} \frac{radian}{sec}$

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