Calculating Average Speed & Time for a Dot on a Spinning Motor

AI Thread Summary
To calculate the average speed of a dot on a spinning motor, the circumference of the circle, determined to be 43.4 cm, is essential. The strobe light flashes at 3959.2 flashes per minute, which indicates the time for one complete revolution can be derived from this frequency. The time between flashes corresponds to the duration of one revolution, allowing for the calculation of average speed using the formula average speed = distance traveled/time. By converting the flashes per minute to seconds, the time for one revolution can be calculated, enabling the determination of average speed in cm/sec. Understanding this relationship between flashes and time is crucial for solving the problem effectively.
sportzmaniac
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Homework Statement



I need to determine the average speed of a dot on a spinning motor and also the time it takes for teh dot to make on revolution. Using a strobe light I determined I needed to do 3959.2 flashes/min in order to make the dot stay in place. The dot is 6.9 cm away from the center of the motor However, I do not know how to use this in order to calculate time and I am stuck

Homework Equations



average speed = distance traveled (cm)/ time sec

The Attempt at a Solution



Using the 6.90 cm, i determined the circumference is 43.4 cm, and I need to use this in calculating the speed someone. However, I do not know how to use this info and the flashes/min to find either the average speed in cm/sec or the time it takes for one revolution. I need help asap please!
 
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The time between flashes is the time for one revolution. Say you have 2 flashes/min then the time between flashes is 1/2 minute. Say you have 4 flashes/min, then the time between flashes is 1/4 min. Get it?
 


I believe so, thank you
 

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