Exam II
Winter 1998
Section A
Name: ________________________
- If the armature of the electric motor in the drill is initially turning with an angular velocity of
o = 2 rad/s. If it is given a constant angular acceleration of
= 20 rad/s2, determine its angular velocity and angular displacement when t = 3 s.
![](key_1.gif)
- At the instant shown, the angular velocity of rod BE is 4 rad/s counterclockwise. Using relative velocity, determine (a) the angular velocity of rod AD, (b) the velocity of collar D. Express all answers as magnitude and direction.
![](key_2.gif)
- In the position shown, bar AB has a constant angular velocity of 3 rad/s counterclockwise. Using instantaneous centers of zero velocity, determine the angular velocity of bars BD and DE. Express all answers as magnitude and direction.
![](key_3.gif)
- The disk has a constant angular velocity of 500 rev/min counterclockwise. Knowing that rod BD is 250 mm long, determine the acceleration of collar D when
= 90o. Express the answer as a magnitude and direction.