MCAT Physics Question -- Frequency | Next Step Test Prep MCAT Physics Question -- Frequency | Next Step Test Prep

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A man drives a go-kart around a circular track with a diameter of 50m, at a rate of 100πm/minute. What is the frequency at which he circles the track in Hertz?

 

  1. 0.0027 Hz
  2. 0.03 Hz
  3. 2 Hz
  4. 6.25 Hz

 

Explanation

 

1030. Hz is a measure of frequency with units cycles/second usually written as 1/sec. The number of cycles around the circle is the velocity/circumference.

The circle circumference is 50πm. The velocity of 100πm/min means that the driver completes 2 laps/min. The frequency in Hz is 2 laps/1min x 1 min/ 60 sec=1/30 Hz=0.03 Hz.

 

  1. 0.0027 Hz, incorrect, This answer results from using the distance as π(25m)2=625πm.
  2. 0.03 Hz, correct.
  3. 2 Hz, incorrect, This is laps/min rather than laps/second.
  4. 6.25 Hz, incorrect, This is the area/velocity with units 1/min rather than 1/sec.

 

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