Easy problem giving me trouble

  • Thread starter tbontom
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In summary, a string trimmer is a tool that uses a rotating nylon string to cut grass and weeds. The string rotates at an angular speed of 42 rev/s and has a tangential speed of 46 m/s. The relationship between angular speed and tangential speed is discussed in the textbook section on angular kinematics. To find the length of the rotating string, one can use the formula w = 2pi*r/t. In order to fully understand this concept, imagining a particle moving in a circle with given radius and tangential speed can be helpful.
  • #1
tbontom
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A string trimmer is a tool for cutting grass and weeds; it utilizes a length of nylon "string" that rotates about an axis perpendicular to one end of the string. The string rotates at an angular speed of 42 rev/s, and its tip has a tangential speed of 46 m/s. What is the length of the rotating string?
 
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  • #2
there is a specific relationship between angular speed and tangential speed. Find the section in your textbook that deals with angular kinematics. Once you find it you will want to hit yourself.

If it helps, imagine a particle moving in a circle of radius 5 meters, with a tangential speed of 1 m/s. How many revolutions would this particle make in one second?
 
  • #3
Its just not clicking, I tried this and it didn't work w = 2pi*42/60
r = 46/w
 
  • #4
i got it and boy do i feel like an idiot, thank buddy
 
  • #5
thanks**
 

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