A uniform rod (mass = 2.0 kg, length = 0.60 m) is free to rotate ...

[Medesa]

A uniform rod (mass = 2.0 kg, length = 0.60 m) is free to rotate about a frictionless pivot at one end. The rod is released from rest in the horizontal position. What is the magnitude of the angular acceleration of the rod at the instant it is 60 below the horizontal?
 a. 15 rad/s2
  b. 12 rad/s2
  c. 18 rad/s2
  d. 29 rad/s2
  e. 23 rad/s2

Question 2

Four identical particles (mass of each = 0.40 kg) are placed at the vertices of a rectangle (2.5 m  4.0 m) and held in those positions by four light rods which form the sides of the rectangle. What is the moment of inertia of this rigid body about an axis that passes through the mid-points of the shorter sides and is parallel to the longer sides?
 a. 2.2 kgm2
  b. 2.8 kgm2
  c. 2.5 kgm2
  d. 3.1 kgm2
  e. 1.6 kgm2

[kaylee05]

Answer to Question 1

B

Answer to Question 2

C

[Medesa]

Gracias!

[Kedrick2014]

TYSM