TASK Double Ferris Wheel Some amusement parks have a double Ferris wheel, which consists of two vertically rotating wheels that are attached to each other by a bar that also rotates. There are eight gondolas equally spaced on each wheel. Riders experience a combination of two circular motions that provide a sensation more thrilling than the classic single Ferris wheel. In particular, riders experience the greatest sensation when their rate of change in height is the greatest. ● of the two wheels is 6 m in diameter and revolves every 12 s. • The rotating bar is 9 m long. The ends of the bar are attached to the centres of the wheels. • The height from the ground to the centre of the bar is 8 m. The bar makes a complete revolution every 20 s. A rider starts seated at the lowest position and moves counterclockwise. The bar starts in the vertical position. Consider the height of a rider who begins the ride in the lowest car. a) Write a function f(t) that expresses the height of the rider relative to the centre of the wheel at time t seconds after the ride starts. Write a second function g (t) that expresses the position of the end of the bar (the centre of the rider's wheel) relative to the ground at time t seconds. b) Explain how the sum of these two functions gives the rider's height above the ground after t seconds. c) Use technology to graph the two functions and their sum for a 2-min ride. d) What is the maximum height reached by the rider? When does this occur? e) What is the maximum vertical speed of the rider? When does this occur? f) Design your own double Ferris wheel. Determine the position function for a rider on your wheel. What is the maximum speed experienced by your riders? Is there a simple relationship between the dimensions of the Ferris

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