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Q. A swimming pool has dimensions 26 m 7 m and the flat bottom. When the pool is filled to a depth of 2.10 m with fresh water, what is the force caused by water on the bottom.

Q. The model airplane is flying at a speed of 23 m/s on a horizontal circle of radius 17 m. The mass of the plane is 0.96 kg. The person holding the guideline pulls it in until the radius becomes 8.0 m. The plane speeds up and tension in the guideline becomes four times greater. What is the net work done on the plane?

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