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Unformatted text preview: Exam III Solutions Part A. Multiple choice questions. Check the best answer. Each question carries a value of 4 points. 1. In Pascals demonstration the barrel shown has height h and cross- section area A . The narrow tube Ftted into its top also has height h . Both the barrel and the tube are Flled with water. 2. The drawing shows a pipe carrying water owing in from the left and out into the air at point 3. The order of increasing pressure at the h h 1 2 3 Physics 53 Summer 2010 1 The pressure at the bottom of the barrel is twice what it would be without the tube, so the oor under the barrel has to provide twice as much upward force. [The oor supports the total weight, which is not twice as large.] The increase in pressure in the barrel is proportional to the volume of water in the tube. [Only the height.] The greatest outward pressure on the sides of the barrel is near the bottom, so that is where it is most likely to burst open. None of the above is true. 1, 2, 3. 3, 1, 2. 3, 2, 1. 2, 3, 1. points is: 3. Because the available broadcast bands are crowded, AM radio stations are required to flter their programming to restrict sound Frequencies to below about 5 kHz, while M stations have no such restriction. As a consequence: Special programming For dogs is limited to M. A violin and a ute playing a note with Fundamental Frequency 3 kHz will sound alike on AM. Rush Limbaugh sounds better on AM. AM signals can be received at greater distances than M. 4. A string oF length 2 m is stretched between two walls. It is observed that standing waves can be set up For Frequencies 200 and 250 Hz, but no Frequency in between. Which oF these is wrong? The Fundamental Frequency is 50 Hz. The two Frequencies cited are those os the 4th and 5th harmonics....
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This note was uploaded on 10/19/2011 for the course PHYSICS 53L taught by Professor Mueller during the Spring '07 term at Duke.
- Spring '07