Physics for Scientists and Engineers: A Strategic Approach 5th Edition · Kinematics in Two Dimensions · Problem Problem_71
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Randall D. Knight — Kinematics in Two Dimensions: Problem Problem_71
Flywheels—rapidly rotating disks—are widely used in industry for storing energy. They are spun up slowly when extra energy is available, then decelerate quickly when needed to supply a boost of energy. A 20-cm-diameter rotor made of advanced materials can spin at 100,000 rpm. a. What is the speed of a point on the rim of this rotor? b. Suppose the rotor’s angular velocity decreases by 40% over 30 s as it supplies energy. What is the magnitude of the rotor’s angular acceleration? Assume that the angular acceleration is constant. c. How many revolutions does the rotor make during these 30 s?
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주어진 조건: . A, 100,000 rpm, . a
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Physics for Scientists and Engineers: A Strategic Approach · 5th Edition
저자: Randall D. Knight
출판사: Pearson
단원: Kinematics in Two Dimensions