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Determing average speed when given a circumference and flahses/min of a strobe light

  1. Sep 23, 2009 #1
    1. The problem statement, all variables and given/known data

    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

    2. Relevant equations

    average speed = distance traveled (cm)/ time sec


    3. 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!
     
  2. jcsd
  3. Sep 23, 2009 #2

    kuruman

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    Re: Determing average speed when given a circumference and flahses/min of a strobe li

    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?
     
  4. Sep 23, 2009 #3
    Re: Determing average speed when given a circumference and flahses/min of a strobe li

    I believe so, thank you
     
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