Serway_CP_poll_ch14

# Serway_CP_poll_ch14 - A 100-m long high-voltage cable is...

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Unformatted text preview: A 100-m long high-voltage cable is suspended between two towers. The mass of the 100-m cable is 150 kg. If the tension in the cable is 30,000 N, what is the lowest frequency at which this cable can oscillate? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 0.7 Hz 2. 1.0 Hz 3. 1.4 Hz 4. 2.0 Hz A standing wave is set up in a 200 cm length string fixed at both ends. The string vibrates in 5 distinct segments when driven by a 120 Hz source. What is the wavelength? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 10 cm 2. 20 cm 3. 40 cm 4. 80 cm Two loudspeakers are placed side by side and driven by the same source at 500 Hz. A listener is positioned in front of the two speakers and on the line separating them, thus creating a constructive interference at the listener's ear. If one of the speakers is gradually pushed toward the listener, how far must it be moved to repeat the condition of constructive interference at the listener's ear? (The speed of sound = 340 m/s) 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 1.02 m 2. 0.68 m 3. 0.34 m 4. 0.17 m A standing wave is set up in a 2.0 m length string fixed at both ends. The string vibrates in 5 distinct segments when driven by a 120 Hz source. What is the natural fundamental frequency of the string? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 24 Hz 2. 48 Hz 3. 240 Hz 4. 600 Hz A standing wave is set up in a 2.0 m length string fixed at both ends. The string vibrates in 5 distinct segments when driven by a 120 Hz source. In how many distinct standing wave segments would the same string vibrate if the tension were increased by A factor of 4? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 3 2. 10 3. 20 4. No standing wave pattern occurs. If a 1000 Hz sound source moves at a speed of 50.0 m/s toward a listener who moves at a speed of 30.0 m/s in a direction away from the source, what is the apparent frequency heard by the listener? (The velocity of sound is 340 m/s.) 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 937 Hz 2. 947 Hz 3. 1060 Hz 4. 1070 Hz The density of a certain metal solid is 7.2 x 10 3 kg/m 3 and its Young's modulus is 10 x 10 10 N/m 2 . What is the velocity of sound in this metal?...
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## This note was uploaded on 01/19/2010 for the course PHYS 200 taught by Professor Davies during the Spring '08 term at Roger Williams.

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Serway_CP_poll_ch14 - A 100-m long high-voltage cable is...

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