Question
A penny is sitting on the edge of an old phonograph disk that is spinning at 33.0 rpm and has a diameter of 12.0 inches. What is the minimum coefficient of static friction between the penny and the surface of the disk to ensure that the penny doesn't fly off?
Step 1
We know that 1 revolution is equal to $2\pi$ radians and 1 minute is equal to 60 seconds. Therefore, the angular speed $\omega$ is given by: \[\omega = 33 \times \frac{2\pi}{60} = 3.46 \, \text{rad/s}\] Show more…
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A penny is sitting on the edge of an old phonograph disk that is spinning at 33 rpm and has a diameter of 12 inches. What is the minimum coefficient of static friction between the penny and the surface of the disk to ensure that the penny doesn't fly off?
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