An extremely light rod 1.00 m long has a 2.00-kg mass attached to ...

[tuffie]

An extremely light rod 1.00 m long has a 2.00-kg mass attached to one end and a 3.00-kg mass attached to the other.
 
  The system rotates at a constant angular speed about a fixed axis perpendicular to the rod that passes through the rod 30.0 cm from the end with the 3.00-kg mass attached. The kinetic energy of the system is measured to be 100.0 J.
  (a) What is the moment of inertia of this system about the fixed axis?
  (b) What is the angular speed (in revolutions per second) of this system?
  What will be an ideal response?

Question 2

A slender uniform rod 100.00 cm long is used as a meter stick. Two parallel axes that are perpendicular to the rod are considered.
 
  The first axis passes through the 50-cm mark and the second axis passes through the 30-cm mark. What is the ratio of the moment of inertia through the second axis to the moment of inertia through the first axis?
  A) I2/I1 = 1.5
  B) I2/I1 = 1.7
  C) I2/I1 = 1.9
  D) I2/I1 = 2.1
  E) I2/I1 = 2.3

[spencer.martell]

Answer to Question 1

Answer: (a) 1.25 kg  m2 (b) 2.01 rev/s

Answer to Question 2

Answer: A

[tuffie]

Gracias!

[mjenn52]

Great answer, keep it coming