A 3.45-kg centrifuge takes 100 s to spin up from rest to its ...

[rachel9]

A 3.45-kg centrifuge takes 100 s to spin up from rest to its final angular speed with constant angular acceleration.
 
  A point located 8.00 cm from the axis of rotation of the centrifuge moves with a speed of 150 m/s when the centrifuge is at full speed.
  (a) What is the angular acceleration (in rad/s2 ) of the centrifuge as it spins up?
  (b) How many revolutions does the centrifuge make as it goes from rest to its final angular speed?

Question 2

A person of mass 50 kg has a de Broglie wavelength of 4.4  10-36 m while jogging. How fast is she running? (h = 6.626  10-34 J  s)
 
  A) 2.0 m/s
  B) 3.0 m/s
  C) 4.0 m/s
  D) 5.0 m/s

[Jmfn03]

Answer to Question 1

(a) 18.8 rad/s2 (b) 1.49  104 revolutions

Answer to Question 2

B