Ch7_TestBank - Chapter 7 Rotational Motion and the Law of...

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Chapter 7, Rotational Motion and the Law of Gravity 87 C HAPTER 7 7.1 Angular Speed and Angular Acceleration 1. 2 600 rev/min is equivalent to which of the following? a. 2600 rad/s b. 43.3 rad/s c. 273 rad/s d. 60 rad/s 2. A grindstone spinning at the rate of 8.3 rev/s has what approximate angular speed? a. 3.2 rad/s b. 26 rad/s c. 52 rad/s d. 81 rad/s 3. A 0.12-m-radius grinding wheel takes 5.5 s to speed up from 2.0 rad/s to 11.0 rad/s. What is the wheel’s average angular acceleration? a. 9.6 rad/s 2 b. 4.8 rad/s 2 c. 1.6 rad/s 2 d. 0.33 rad/s 2 4. What is the angular speed about the rotational axis of the Earth for a person standing on the surface? a. 7.3 × 10 - 5 rad/s b. 3.6 × 10 - 5 rad/s c. 6.28 × 10 - 5 rad/s d. 3.14 × 10 - 5 rad/s 5. A spool of thread has an average radius of 1.00 cm. If the spool contains 62.8 m of thread, how many turns of thread are on the spool? a. 100 b. 1 000 c. 3 140 d. 62 800
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Chapter 7, Rotational Motion and the Law of Gravity 88 6. A ceiling fan is turned on and reaches an angular speed of 120 rev/min in 20 s. It is then turned off and coasts to a stop in an additional 40 s. The ratio of the average angular acceleration for the first 20 s to that for the last 40 s is which of the following? a. 2 b. 0.5 c. –0.5 d. –2 7.2 Rotational Motion Under Constant Angular Acceleration 7. A 0.30-m-radius automobile tire rotates how many rad after starting from rest and accelerating at a constant 2.0 rad/s 2 over a 5.0-s interval? a. 12.5 rad b. 25 rad c. 2.0 rad d. 0.50 rad 8. A fan blade, initially at rest, rotates with a constant acceleration of 0.025 rad/s 2 . What is its angular speed at the instant it goes through an angular displacement of 4.2 rad? a. 0.025 rad/s b. 0.11 rad/s c. 0.46 rad/s d. 1.2 rad/s 9. A fan blade, initially at rest, rotates with a constant acceleration of 0.025 rad/s 2 . What is the time interval required for it to reach a 4.2-rad displacement after starting from rest? a. 1.8 s b. 2.0 s c. 16 s d. 18 s 10. A ceiling fan is turned on and reaches an angular speed of 120 rev/min in 20 s. It is then turned off and coasts to a stop in 40 s. In the one minute of rotation, through how many revolutions did the fan turn? a. 20 b. 60 c. 0 d. 600
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Chapter 7, Rotational Motion and the Law of Gravity 89 11. Starting from rest, a wheel undergoes constant angular acceleration for a period of time T . At what time after the start of rotation does the wheel reach an angular speed equal to its average angular speed for this interval? a. 0.25 T b. 0.50 T c. 0.67 T d. 0.71 T 12. Starting from rest, a wheel undergoes constant angular acceleration for a period of time T . At which of the following times does the average angular acceleration equal the instantaneous angular acceleration? a. 0.50 T
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Ch7_TestBank - Chapter 7 Rotational Motion and the Law of...

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