The Doppler effect is observed when the source and the observer ...

[kwoodring]

The Doppler effect is observed when the source and the observer are at rest with respect to each other.
 
  Indicate whether the statement is true or false

Question 2

A uniform disk has a mass of 3.7 kg and a radius of 0.40 m. The disk is mounted on frictionless bearings and is used as a turntable. The turntable is initially rotating at 30 rpm.
 
  A thin-walled hollow cylinder has the same mass and radius as the disk. It is released from rest, just above the turntable, and on the same vertical axis. The hollow cylinder slips on the turntable for 0.20 s until it acquires the same final angular velocity as the turntable. What is the final angular momentum of the system? A) 0.93 kg  m2/s
  B) 1.1 kg  m2/s
  C) 1.3 kg  m2/s
  D) 1.6 kg  m2/s
  E) 1.9 kg  m2/s

[vseab]

Answer to Question 1

FALSE

Answer to Question 2

A

[kwoodring]

TYSM

[xiazhe]

Excellent