6.6 x 10 6 6.6 x 10 7 6.6 x 10 4 3.3 x 10 3 3.3 x 10 6

1. A car of mass 1000 kg moves with a speed of 60 m/s on a circular track of radius 110 m. What is the magnitude of its angular momentum (in kg·m2/s) relative to the center of the race track? Select the correct answer. • 6.6 x 106 • 6.6 x 107 • 6.6 x 104 • 3.3 x 103 • 3.3 x 106

2. A particle whose mass is 3 kg moves in the xy plane with a constant speed of 4 m/s in the x -direction along the line y = 3. What is its angular momentum (in kg·m2/s) relative to the origin? Select the correct answer. • -36k • 36k • -12k • 12k • -48k

3. A solid cylinder of radius R = 1.0 m and mass 6 kg rotates about its axis. When its angular velocity is 10 rad/s, its angular momentum (in kg·m2/s) is _____ . Select the correct answer. • 30 • 35 • 45 • 25 • 15

4. Two vectors lying in the xz plane are given by the equations A = 3i +3k and B = -2i + 4k . The value of A x B is _____ . Select the correct answer. • -18j • 18k • -27j • 27j • -22i + 25k

5. Stars originate as large bodies of slowly rotating gas. Because of gravity, these clumps of gas slowly decrease in size. The angular velocity of a star increases as it shrinks because of _____ . Select the correct answer. • conservation of angular momentum • conservation of linear momentum • conservation of energy • the law of universal gravitation • conservation of mass

6. A skater extends her arms horizontally, holding a 8-kg mass in each hand. She is rotating about a vertical axis with an angular velocity of one revolution per second. If she drops her hands to her sides, what will the final angular velocity (in rev/s) be if her moment of inertia remains approximately constant at 7 kg·m2, and the distance of the masses from the axis changes from 1.1 m to 0.2 m? Select the correct answer. • 3 • 1 • 6 • 8 • 2