Let the pressure gradient in the pipe be 1300 Pa/m and the diameter of the pipe be 4.0 m. What is the average speed through this pipe of 20 degrees celsius motor oil? Express your answer in millimeters per second. What is the average speed through this pipe of 100∘C motor oil? Express your answer in millimeters per second.

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Variation of pressure

From the equation of pressure, pressure is directly proportional to the applied force.