Bird Wheeler
03/26/2023 · Primary School
A flywheel with a diameter of 20 is rotating at \( 15 \frac{\text { radians }}{\text { second }} \). What is the speed of a point on the rim of the fywheel measured in fu/min?
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Step-by-step Solution
To find the speed of a point on the rim of the flywheel in feet per minute (fu/min), we can follow these steps:
1. **Calculate the radius of the flywheel**: The diameter of the flywheel is given as 20 units, so the radius \( r \) is:
\[
r = \frac{\text{diameter}}{2} = \frac{20}{2} = 10 \text{ units}
\]
2. **Calculate the linear speed**: The linear speed \( v \) of a point on the rim of the flywheel can be calculated using the formula:
\[
v = r \cdot \omega
\]
where \( \omega \) is the angular speed in radians per second. Given that \( \omega = 15 \frac{\text{radians}}{\text{second}} \), we can substitute the values:
\[
v = 10 \cdot 15 = 150 \text{ units/second}
\]
3. **Convert the speed to feet per minute**: To convert from units per second to feet per minute, we use the conversion factor \( 1 \text{ minute} = 60 \text{ seconds} \):
\[
v = 150 \text{ units/second} \times 60 \text{ seconds/minute} = 9000 \text{ units/minute}
\]
Thus, the speed of a point on the rim of the flywheel is \( 9000 \) units per minute. If the units are in feet, then the speed is \( 9000 \text{ feet/minute} \).
Quick Answer
The speed of a point on the rim of the flywheel is \( 9000 \text{ feet/minute} \).
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