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Two problems involving angular velocity:

  • Thread starter Bob Loblaw
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  • #1
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Two problems involving angular velocity:

Edit: Problem one solved! Hooray!

2.The Milky Way galaxy rotates about its center with a period of about 192 million years. The Sun is 2x10^20 m from the center of the galaxy. How fast is the Sun moving with respect to the center of the galaxy?

For this problem I took 2pi/T which gave me 2pi/192000000 and multiplied the result by 2x10^20m. I then expressed the answer in kilometers which gave me 6544984695km. This was not correct. Any suggestions?

Thanks for your generous help!
 
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Answers and Replies

  • #2
learningphysics
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The number you have is in units of km/year... are these the units you need?
 
  • #3
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Yes - it was indeed a problem of units. I took 2pi/(195 million years)(second in a year) * 2.0x10^20 and came up with the correct answer once I converted centimeters into kilometers.

Thanks!
 

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