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·m 2 /s) relative to the center of the race track? Select the correct answer. 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.6.6 x 10 6 2.6.6 x 10 7 3.6.6 x 10 4 4.3.3 x 10 3 5.3.3 x 10 6

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·m 2 /s) relative to the origin? Select the correct answer. 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.-36k 2.36k 3.-12k 4.12k 5.-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·m 2 /s) is _____. Select the correct answer. 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.30 2.35 3.45 4.25 5.15

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. 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.-18j 2.18k 3.-27j 4.27j 5.-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. 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.conservation of angular momentum 2.conservation of linear momentum 3.conservation of energy 4.the law of universal gravitation 5.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·m 2, and the distance of the masses from the axis changes from 1.1 m to 0.2 m? Select the correct answer. 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.3 2.1 3.6 4.8 5.2