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Q1. Assume that biological substances are 98 percent water; estimate the masses of a cell with a diameter of 1.3µm, a human kidney, and a fly. Take a kidney to be roughly a sphere with a radius of 3.60cm and a fly to be roughly a cylinder 4.2 mm long and 1.0 mm in diameter.

Q2. A brick is thrown vertically upward with an initial speed of 4.90 m/s from the roof of a building. If the building is 98 m tall, how much time passes before brick lands on the ground?

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