A lathe, initially at rest, accelerates at 0.60 rad/s2 for 10 s, ...

[Sportsfan2111]

A lathe, initially at rest, accelerates at 0.60 rad/s2 for 10 s, then runs at a constant angular velocity for 20 s, and finally decelerates uniformly for 10 s to come to a complete stop. What is its average angular velocity?
 
  A)
 
  4.5 rad/s
 
  B)
 
  3.5 rad/s
 
  C)
 
  5.0 rad/s
 
  D)
 
  3.0 rad/s
 
  E)
 
  4.0 rad/s

Question 2

White light incident normal to a thin soap film with n = 1.34 reflects with an interference maximum at 684 nm and an interference minimum at 570 nm with no minima between those two values. What is the thickness of the soap film?
 
  A)
 
  766 nm
  B)
 
  627 nm
  C)
 
  638 nm
  D)
 
  894 nm
  E)
 
  510 nm

[31809pancho]

Answer to Question 1

A

Answer to Question 2

C