Question

How is RPM calculated?

Answer 1

RPM, or revolutions per minute, is a measure of the frequency of rotation. It's calculated by taking the number of complete revolutions an object makes in one minute.

To calculate RPM, you can use the formula:

\[ \text{RPM} = \left( \frac{\text{Number of Revolutions}}{\text{Time in Minutes}} \right) \]

If you measure the number of revolutions in a different time frame, like seconds, you can convert that time to minutes. For example, if an object makes 30 revolutions in 10 seconds, you can convert the time:

1. Convert seconds to minutes: \( 10 \, \text{seconds} = \frac{10}{60} \, \text{minutes} = \frac{1}{6} \, \text{minutes} \).
2. Then, apply the formula:
   \[
   \text{RPM} = \frac{30 \, \text{revolutions}}{\frac{1}{6} \, \text{minutes}} = 30 \times 6 = 180 \, \text{RPM}
   \]

So, in this example, the object would be rotating at 180 RPM.

Answer 2

RPM, or Revolutions Per Minute, is a measure of the number of complete revolutions a rotating object makes in one minute. To calculate RPM, you can use the following formula:

\[ \text{RPM} = \frac{\text{Number of Revolutions}}{\text{Time in Minutes}} \]

Here’s a step-by-step process:

1. **Count the Revolutions**: Determine how many complete revolutions the object makes in a given time period.

2. **Measure the Time**: Measure the time taken for those revolutions. This can be in seconds, minutes, or any other unit of time.

3. **Convert Time to Minutes**: If your time is not already in minutes, convert it to minutes. For example, if you measured the revolutions in seconds, divide the number of seconds by 60 to convert to minutes.

4. **Apply the Formula**: Plug the values into the formula to get the RPM.

**Example:**

If a wheel makes 120 revolutions in 2 minutes:

\[ \text{RPM} = \frac{120 \text{ revolutions}}{2 \text{ minutes}} = 60 \text{ RPM} \]