A horizontal disk with a radius of 10 cm rotates about a vertical ...

[tfester]

A horizontal disk with a radius of 10 cm rotates about a vertical axis through its center. The disk starts from rest at t = 0 and has a constant angular acceleration of 2.1 rad/s2 . At what value of t will the radial and tangential components of the linear acceleration of a point on the rim of the disk be equal in magnitude?
 a. 0.55 s
  b. 0.63 s
  c. 0.69 s
  d. 0.59 s
  e. 0.47 s

Question 2

A disk (radius = 8.0 cm) that rotates about a fixed axis starts from rest and accelerates at a constant rate to an angular velocity of 4.0 rad/s in 2.0 s. What is the magnitude of the total linear acceleration of a point on the rim of the disk at the instant when the angular velocity of the disk is 1.5 rad/s?
 a. 24 cm/s2
  b. 16 cm/s2
  c. 18 cm/s2
  d. 34 cm/s2
  e. 44 cm/s2

[AngeliqueG]

Answer to Question 1

C

Answer to Question 2

A

[tfester]

Excellent

[softEldritch]

TYSM