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Q1. Assuming biological substances are 98 percent water, estimate the masses of a cell with a diameter of 0.7 µm, a human kidney, and a fly. Take a kidney to be roughly a sphere with a radius of 5.0 cm and a fly to be roughly a cylinder 4.90 mm long and 2.50 mm in diameter.

Q2. A golf ball is struck with a five iron on level ground. It lands 90.80 m away 4.7 s later. What was the direction of the initial velocity? Give an angle counter clockwise relative to the horizontal.

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