Why is it difficult to swim under water in the Great Salt Lake?Ģ1. Sandbags are placed around the leak, and the water held by them rises until it is the same level as the river, at which point the water there stops rising.Ģ0. Explain how the small amount of water inside the column formed by the sandbags is able to balance the much larger body of water behind the levee.īecause the river level is very high, it has started to leak under the levee. Figure shows how sandbags placed around a leak outside a river levee can effectively stop the flow of water under the levee. What are two reasons why mercury rather than water is used in barometers?ġ9.
Why does atmospheric pressure decrease more rapidly than linearly with altitude?ġ8. Atmospheric pressure exerts a large force (equal to the weight of the atmosphere above your body-about 10 tons) on the top of your body when you are lying on the beach sunbathing. How do you convert pressure units like millimeters of mercury, centimeters of water, and inches of mercury into units like newtons per meter squared without resorting to a table of pressure conversion factors?ġ1.4: Variation of Pressure with Depth in a Fluidġ6. Toe dancing (as in ballet) is much harder on toes than normal dancing or walking.
How do jogging on soft ground and wearing padded shoes reduce the pressures to which the feet and legs are subjected?ġ4. If both chunks of ice should melt due to rising global temperatures (and the melted ice all goes into the lake), which ice chunk would give the greatest increase in the level of the lake water, if any?ġ3. Next to the lake (assume it is not frozen) sits a comparably sized glacier sitting on land. In a remote location near the North Pole, an iceberg floats in a lake. Why is force exerted by static fluids always perpendicular to a surface?ġ2. How is this force balanced? (The tank does not accelerate, so the force must be balanced.)ġ1. The outward force on one end of an air tank was calculated in Example. Why does a dull hypodermic needle hurt more than a sharp one?ġ0. How is pressure related to the sharpness of a knife and its ability to cut?ĩ.
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