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Author Question: An electrical motor spins at a constant 2857.0 rev/min. If the armature radius is 2.685 cm, what is ... (Read 167 times)

mpobi80

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on: Jul 29, 2018
An electrical motor spins at a constant 2857.0 rev/min. If the armature radius is 2.685 cm, what is the acceleration of the outer edge of the armature?
 
  A) 2403 m/s2
  B) 844.4 m/s2
  C) 241,100 m/s2
  D) 84.40 m/s2

Question 2

An ice skater doing a spin pulls in her arms, decreasing her moment of inertia by a factor of two. How does her angular speed changes?
 
  A) It is reduced by a factor of two.
  B) It is reduced by a factor of four.
  C) It increases by a factor of two.
  D) It increases by a factor of four.
  E) It doesn't change.


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Cnarkel

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Reply #1 on: Jul 29, 2018
Answer to Question 1

A

Answer to Question 2

C


mpobi80

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Reply 2 on: Jul 29, 2018
Great answer, keep it coming :)

Dinolord

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Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

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