Here is a demonstration Pascal used to show the importance of a fluid’s pressure on the fluid’s depth (Fig. 9.36): An oak barrel with a lid of area 0.20 m2 is filled with water. Along, thin tube of cross-sectional area 5.0 x 10–5 m2 is inserted into a hole at the center of the lid, and water is poured into the tube. When the water reaches 12 m high, the barrel bursts.
(a) What was the weight of the water in the tube?
(b) What was the pres-sure of the water on the lid of the barrel?
(c) What was the net force on the lid due to the water pressure?

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