Question

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Event 2: The downhill Sail Coaster (Ahmed) In this event, the rider pedals a cart with a sail on it along a horizontal surface to get it up to speed. Just as the cart begins to go down a hill (angle 10) below the horizontal, the rider stops pedaling (i.e. the cart coasts downhill). The winner is the team whose cart comes closest to going down the incline at a constant speed. You know the density of the air (ρ = 1.2 kg/m) and the drag coefficient for your cart with sail (C 1-5), and the effective area of the sail (A 2 m2. The mass of your cart (including Ahmed, your rider) is 150 kg. How fast should Ahmed get the cart moving on the horizontal surface to win this competition? (Friction from the wheel is negligible compared to the other forces involved in this problem.) t diagrams (e.g., free-body diagrams) and show your calculations. 2

Answer 1

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