An ice skater has a moment of inertia of 5.0 kgm2 when her arms ...

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An ice skater has a moment of inertia of 5.0 kgm2 when her arms are outstretched. At this time she is spinning at 3.0 revolutions per second (rps).
 
  If she pulls in her arms and decreases her moment of inertia to 2.0 kgm2, how fast will she be spinning?
  A)
 
  2.0 rps
 
  B)
 
  3.3 rps
 
  C)
 
  7.5 rps
 
  D)
 
  8.4 rps
 
  E)
 
  10 rps

Question 2

State Einstein's principle of equivalence.
 
  What will be an ideal response?

[kardosa007]

Answer to Question 1

C

Answer to Question 2

There is no experiment observers can perform to distinguish if an acceleration arises because of a gravitational force or because their reference frame is accelerated.