# Midterm3Practice1withAnswers - Fall 2010 PHYS116A-02...

Fall 2010 PHYS116A-02 Midterm 3 Practice test 1 1. Two disks are mounted on low-friction bearings on a common shaft. The first disc has rotational inertia I and is spinning with angular velocity ϖ . The second disc has rotational inertia 2 I and is spinning in the same direction as the first disc with angular velocity 2 ϖ as shown. The two disks are slowly forced toward each other along the shaft until they couple and have a final common angular velocity of: A) 5 ϖ /3 B) 3 ϖ C) 7 3 ϖ D) ϖ E) 3 ϖ 2. A 2.0-kg block travels around a 0.50-m radius circle with an angular velocity of 12 rad/s. The magnitude of its angular momentum about the center of the circle is: A) 6.0 kg m 2 /s B) 12 kg m 2 /s C) 48 kg/m 2 s D) 72 kg m 2 /s 2 E) 576 kg/m 2 s 2 3. A 6.0-kg particle moves to the right at 4.0 m/s as shown. The magnitude of its angular momentum about the point O is: Page 1
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