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Chapter 11: Q8CQ (page 394)
How is pressure related to the sharpness of a knife and its ability to cut?
The surface area of the knife decreases when it becomes sharper.
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Figure 11.41shows how sandbags placed around a leak outside a river levee can effectively stop the flow of water under the levee. 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.
Figure 11.41Because the river level is very high, it has started to leak under the levee. 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.
In a remote location near the North Pole, an iceberg floats in a lake. Next to the lake (assume it is not frozen) sits a comparably sized glacier sitting on land. 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?
Why is it difficult to swim under water in the Great Salt Lake?
(a) What is the mass of a deep breath of air having a volume of ? (b) Discuss the effect taking such a breath has on your body鈥檚 volume and density.
Suppose the master cylinder in a hydraulic system is at a greater height than the slave cylinder. Explain how this will affect the force produced at the slave cylinder.
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