A thin 320g disk with a diameter of 5.20 cm rotates about, Ask an Expert

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Q. A thin 320g disk with a diameter of 5.20 cm rotates about an axis through its center with 0.705J of kinetic energy. What is the speed (in m/s) of a point on rim?

Q. In the afternoon, the decibel level of a busy freeway is 80 dB with 100 cars passing a given minute. Late at night, the traffic flow is only five cars per minute. What is the late-night decibel level?

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