A wheel rotates through an angle of 320 as it slows down from ...

[jho37]

A wheel rotates through an angle of 320 as it slows down from 78.0 rpm to 22.8 rpm. What is the magnitude of the average angular acceleration of the wheel?
 
  A)
 
  2.34 r rad/s2
 
  B)
 
  5.48 rad/s2
 
  C)
 
  6.50 rad/s2
 
  D)
 
  8.35 rad/s2
  E)
 
  10.9 rad/s2

Question 2

A thin layer of oil (n = 1.25 ) is on top of a puddle of water (n = 1.33). If normally incident 500 nm light is strongly reflected, what is the minimum thickness of the oil layer?
 
  A)
 
  200 nm
  B)
 
  250 nm
  C)
 
  100 nm
  D)
 
  400 nm
  E)
 
  150 nm

[EAN94]

Answer to Question 1

B

Answer to Question 2

A

[jho37]

TYSM

[strudel15]

Excellent