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

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SUMMARY

The discussion focuses on calculating the average speed and time for a dot on a spinning motor using strobe light flashes. The user determined that 3959.2 flashes per minute are required to make the dot appear stationary, with the dot positioned 6.9 cm from the center of the motor. The circumference of the dot's path is calculated to be 43.4 cm. The average speed can be derived from the formula: average speed = distance traveled (cm) / time (sec), where the time for one revolution is determined by the inverse of the flashes per minute.

PREREQUISITES
  • Understanding of rotational motion and angular velocity
  • Familiarity with basic physics equations, particularly average speed calculations
  • Knowledge of strobe light functionality and its application in motion analysis
  • Ability to perform unit conversions between minutes and seconds
NEXT STEPS
  • Calculate average speed using the formula: average speed = circumference / time for one revolution
  • Explore the relationship between flashes per minute and time intervals for revolutions
  • Investigate the effects of varying distances from the center on average speed calculations
  • Learn about the principles of stroboscopic motion and its applications in physics
USEFUL FOR

Students in physics, engineering enthusiasts, and anyone interested in understanding rotational dynamics and motion analysis using strobe lights.

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 the 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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