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Unformatted text preview: 3. In Figure 15.30 on page 461 of Knight, how the stream of water emerging from a faucet necks down as it falls. The cross-sectional area of the faucet opening is 1.2 cm 2 , and 45 mm down the ow tube diameter narrows and the area becomes 0.35 cm 2 . At what rate does water ow from the tap? 4. Assuming that air can be treated as an ideal uid explain, with the aid of sketches, why it is that on a windy day it is always windier (at ground level) near the base of the tower of the physics building than it is far from the tower. Why is the height, as well as the width, of a building relevant to the wind speed near the ground? (Note that the assumption that air is an ideal uid is not very good because the air ow becomes turbulent, especially on the downstream side of obstructions such as buildings. Upstream it may not be so bad.)...
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- Spring '12