Chapter SH, Problem 7.5APP

To determine

To calculate: Number of revolutions a coil makes in five minutes.

Answer to Problem 7.5APP

Number of revolutions the coil makes in 5 minutes is $\underset{\_}{\text{18000}}$ .

Explanation of Solution

Given:

Frequency of alternating current = $\text{60 Hz}$

Number of revolutions each second = $\text{60}$

Calculation:

  $\begin{array}{l}\text{1 minute = 60 seconds}\\ \text{5 minutes =}\left(60\times 5\right)=300\text{ seconds}\end{array}$

Number of revolutions the coil makes in 1 second = $\text{60}$

Number of revolutions the coil makes in 5 minutes (300 seconds) = $\text{60}\times \text{300 = 18000}$

Conclusion:

Number of revolutions the coil makes in 5 minutes is $\underset{\_}{\text{18000}}$ .