Look here for the book's answers to HW20.
For HW21, some students suggested that the fall time from the 6 o'clock position of a moving Ferris wheel will be the same time as just dropping the diver from the 6 o'clock position of a non-moving Ferris wheel.
Is this true? 
At the 6 o'clock position, won't the diver move similar to this ball to the right? And this definately has to take more time than just falling straight down from the 6 o'clock position, doesn't it?
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