1. What is the flow rate and the volume that passes through the artery in a period of 50 s, if blood is flowing through an artery of radius 2 mm at a rate of 38 cm/s?

2. Water flows at a speed of 15 m/s through a pipe that has a radius of 40 cm. The water then flows through a smaller pipe at a speed of 45 m/s. What is the diameter of the smaller pipe?

3. If the surface area of a roof of a building is 600 m and it is said to be able to withstand a velocity of 90 m/s air guests, how much force could a roof support if the air density is 1.03 kg/m?

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