Most microwave ovens have a glass tray that sits on top of a circular ring with three small wheels, as shown in FIGURE 10-30. A small motor in the base of the microwave rotates the glass tray to provide uniform heating. When the glass tray completes one revolution, does the circular ring below it rotate through 0.5 rev, 1 rev, 2 rev, or 3 rev? Explain.

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