In a high-tech laboratory, a circular experimental platform rotates at a speed of 7300 rpm. An observation device is fixed 4.00 cm away from the center of the platform. What is the linear speed of the point beneath the observation device?

• A. 12 m/s
• B. 25 m/s
• C. 28 m/s
• D. 31 m/s

Answer: (D)