Question

A wooden disc of radius \( 30 \mathrm{~cm} \) and mass \( 1.0 \mathrm{~kg} \) spins at 50 revolutions per minute (rpm) 5. What is its rotation frequency? A. \( 0.38 \mathrm{~Hz} \) B. \( 0.9 \mathrm{~Hz} \) C. \( 0.83 \mathrm{~Hz} \) D. \( 8.3 \mathrm{~Hz} \) E. \( 83 \mathrm{~Hz} \) 6) Its angular velocity is A. \( 25 \mathrm{rad} \mathrm{s}^{-1} \) B. \( 5.2 \mathrm{rad} \mathrm{s}^{-1} \) C. \( 52 \mathrm{rad} \mathrm{s}^{-1} \) D. \( 520 \mathrm{rad} \mathrm{s}^{-1} \) E. \( 2.5 \mathrm{rad} \mathrm{s}^{-1} \) 7. What is the rotational kinetic energy of this disc? A. \( 2.47 \mathrm{~J} \) B. \( 24.7 \mathrm{~J} \) C. 247 J D. \( 427 \mathrm{~J} \) E. \( 42.7 \mathrm{~J} \)

          A wooden disc of radius \( 30 \mathrm{~cm} \) and mass \( 1.0 \mathrm{~kg} \) spins at 50 revolutions per minute (rpm)
5. What is its rotation frequency? A. \( 0.38 \mathrm{~Hz} \) B. \( 0.9 \mathrm{~Hz} \) C. \( 0.83 \mathrm{~Hz} \) D. \( 8.3 \mathrm{~Hz} \) E. \( 83 \mathrm{~Hz} \)
6) Its angular velocity is A. \( 25 \mathrm{rad} \mathrm{s}^{-1} \) B. \( 5.2 \mathrm{rad} \mathrm{s}^{-1} \) C. \( 52 \mathrm{rad} \mathrm{s}^{-1} \) D. \( 520 \mathrm{rad} \mathrm{s}^{-1} \) E. \( 2.5 \mathrm{rad} \mathrm{s}^{-1} \)
7. What is the rotational kinetic energy of this disc? A. \( 2.47 \mathrm{~J} \) B. \( 24.7 \mathrm{~J} \) C. 247 J D. \( 427 \mathrm{~J} \) E. \( 42.7 \mathrm{~J} \)

A wooden disc of radius 30 cm and mass 1.0 kg spins at 50 revolutions per minute (rpm)
5. What is its rotation frequency? A. 0.38 Hz B. 0.9 Hz C. 0.83 Hz D. 8.3 Hz E. 83 Hz
6) Its angular velocity is A. 25 rads^-1 B. 5.2 rads^-1 C. 52 rads^-1 D. 520 rads^-1 E. 2.5 rads^-1
7. What is the rotational kinetic energy of this disc? A. 2.47 J B. 24.7 J C. 247 J D. 427 J E. 42.7 J

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