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

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
kgm2/s) relative to the center of the race
track? Select the correct answer.

1. 6.6 x 106
2. 6.6 x 107
3. 6.6 x 104
4. 3.3 x 103
5. 3.3 x 106

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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 kgm2/s) relative to the
origin? Select the correct answer.

1. -36k
2. 36k
3. -12k
4. 12k
5. -48k

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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
kgm2/s) is _____ . Select the correct
answer.

1. 30
2. 35
3. 45
4. 25
5. 15

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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.

1. -18j
2. 18k
3. -27j
4. 27j
5. -22i 25k

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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.

1. conservation of angular momentum
2. conservation of linear momentum
3. conservation of energy
4. the law of universal gravitation
5. conservation of mass

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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 kgm2, and the
distance of the masses from the axis changes from
1.1 m to 0.2 m? Select the correct answer.

1. 3
2. 1
3. 6
4. 8
5. 2

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