PHY2048 - GENERAL PHYSICS I
REVISION QUESTIONS FOR CHAPTER 9

Below you will find a set of 5 conceptual and numerical revision questions selected randomly from lots of questions I have put together covering the material in Chapter 9, "Rotation". This includes questions on angular velocity, angular acceleration, torque, moment of inertia and rotational kinetic energy. When you have finished the quiz, click on the "Submit Quiz" button at the bottom and within seconds it will be automatically graded and the results returned to you!

To select a new set of questions click on the "Reload" or "Refresh" button on your browser. You may find some of the questions duplicated but that's the nature of a random selection. Try it a few times ... it's not fattening and you may learn something!

Many thanks to Mark Wood for producing the quiz-maker code.


Q1: A grindstone of radius 4.0 m is initially spinning with a constant angular speed of 8.0 rad/s. The angular speed is then increased to 10 rad/s over the next 4.0 seconds. Assume that the angular acceleration is constant. What is the magnitude of the angular acceleration of the grindstone?

0.50 rad/s2
2.0 rad/s2
4.5 rad/s2
9.0 rad/s2
18 rad/s2

Q2: A wheel of radius 0.5 m rotates with a constant angular speed about an axis perpendicular to its center. A point on the wheel that is 0.2 m from the center has a tangential speed of 2 m/s. What is the tangential speed of a point 0.4 m from the center of the wheel?

0.4 m/s
2.0 m/s
4.0 m/s
10.0 m/s
20.0 m/s

Q3: A wheel of radius 0.5 m rotates with a constant angular speed about an axis perpendicular to its center. A point on the wheel that is 0.2 m from the center has a tangential speed of 2 m/s. What is the tangential acceleration of the point that is 0.2 m from the center?

0.4 m/s2
2.0 m/s2
4.0 m/s2
10 m/s2
zero

Q4: A penny is placed 0.10 m from the center of a turntable. If the coefficient of static friction between the penny and the turntable is 0.50, the maximum linear speed at which the penny can travel without slipping is approximately

0.70 m/s
0.98 m/s
1.3 m/s
1.4 m/s
0.20 km/s

Q5: A uniform cylinder of diameter 0.20 m and mass 12 kg rolls without slipping down a 37° inclined plane. The acceleration of the cylinder down the plane is approximately

2.0 m/s2
3.9 m/s2
4.9 m/s2
5.8 m/s2
9.8 m/s2

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