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# Rotational Motion Principles: Tutoring Solution Chapter Exam

Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. Good luck!

### Page 1

#### Question 1 1. Why are light bulbs measured in watts (power) instead of joules (work)?

#### Question 2 2. A 1000 kg satellite orbits Earth at 5000 m/s. It is at 1.65 Earth radii, where the radius of the earth is 6371 km. What is the satellite's angular momentum?

#### Question 3 3. Why is it easier to open a door by pushing a long way from the hinge?

#### Question 4 4. What is the definition of angular velocity?

#### Question 5 5. What is rotational kinetic energy?

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####
Question 6
6.
In a question, you're given the initial angular velocity, the angular acceleration, and the change in angle and asked to calculate how long it took to accelerate. Which equation should you use to solve this problem?

(Note: In the images below, w0 is the initial angular velocity, and w is the final angular velocity. This is another way of notating the same thing, which you may well see in problems and tests.)

#### Question 7 7. Which of the following is a correct definition of moment of inertia?

#### Question 8 8. Which of the following is NOT a rotational kinematics quantity?

#### Question 9 9. What is the angle between the velocity and radius of an object moving in a perfect circle?

#### Question 10 10. Which of the following defines inertia?

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#### Question 11 11. Which of the following is a correct definition of torque?

#### Question 12 12. A planet is orbiting a star in a perfect circle. It has a velocity of 4x10^4 m/s, a mass of 3 x 10^24 kg. If at a particular moment it's orbiting at a radius of 2 x 10^11 meters, how much angular momentum does it have?

####
Question 13
13.
Use the following data from a repeat of the ball experiment, to figure out the moment of inertia of a second ball:

Mass of the ball: 1 kg.

Radius of the ball: 0.02 meters.

Height of the hill: 0.3 meters.

Translational velocity at bottom: 2.2 m/s

Rotational velocity at bottom: 80 rads/s

#### Question 14 14. If the angular velocity of a spinning disk is 6 radians per second, and four seconds later it is 20 radians per second, what is the angular acceleration of the disk during that time?

#### Question 15 15. Which of the following is NOT a rotational quantity used in physics?

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#### Question 16 16. A merry-go-round is pushed with a torque of 500 newton-meters, around an angle of 2-pi radians. How much work is done in this process?

#### Question 17 17. A spinning top with uniform mass distribution is rotating around its axis at a rate of three rotations every six seconds. If the moment of inertia of the object is 2 kg m^2, how much rotational kinetic energy does the spinning top contain?

####
Question 18
18.
Which of the following is NOT one of the big 5 equations for rotational motion with a constant acceleration?

(Note: In the images below, w0 is the initial angular velocity, and w is the final angular velocity. This is another way of notating the same thing, which you may well see in problems and tests.)

#### Question 19 19. If the initial angle of a turntable compared against an arbitrary line is 20 degrees, and half a second later it has rotated to 370 degrees, what is the angular velocity of the turntable?

#### Question 20 20. A certain disk has a moment of inertia of 1000 kg⋅m2. What torque would be required to get it to spin from rest to 10 revolutions-per-second in 0.5 sec?

### Page 5

#### Question 21 21. Which of the following defines ROTATIONAL inertia?

#### Question 22 22. Which of the following is the rotational version of Newton's 2nd Law?

#### Question 23 23. Which of the following people has the most linear momentum?

#### Question 24 24. How do we know that rotating objects have kinetic energy?

#### Question 25 25. If it wasn't for friction or air resistance, what would happen to a spinning top?

### Page 6

#### Question 26 26. Which of the following is a correct definition of moment of inertia?

#### Question 27 27. Which of the following is an example of an object experiencing translational motion?

#### Question 28 28. Which of the following is an example of an object experiencing rotational motion?

#### Question 29 29. Which of the following is the rotational version of Newton's 1st Law?

#### Question 30 30. A spinning top increases the rate at which it spins from 5 radians per second, at an angular acceleration of 3 radians per second per second. If it continues to accelerate for 4 seconds, what will the final angular velocity be?

#### Rotational Motion Principles: Tutoring Solution Chapter Exam Instructions

Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. Good luck!