This preview shows pages 1–3. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: shah (rps587) HW 12 Kleinman (58225) 1 This printout should have 24 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. This HW covers Chs. 16 17. 001 10.0 points Andrea asked her brother to take a 4 ft float ing raft out of the water near the waveswept shore. Using this raft as a measuring tool, she estimated that the wavelengths of these particular ocean waves were about 10 ft. How fast are these surface ocean waves if the frequency remains 1 3 Hz? Correct answer: 3 . 33333 ft / s. Explanation: Let : = 10 ft and f = 1 3 Hz . v = f = parenleftbigg 1 3 Hz parenrightbigg (10 ft) = 3 . 33333 ft / s . keywords: 002 (part 1 of 2) 10.0 points A harmonic wave in a wire has amplitude 1 . 43 mm, wavelength 2 . 81 m, and frequency 907 Hz. What is the propagation speed of the wave? Correct answer: 2548 . 67 m / s. Explanation: Let : A = 1 . 43 mm , = 2 . 81 m , and f = 907 Hz . For a traveling wave, v = f = (2 . 81 m) (907 Hz) = 2548 . 67 m / s . 003 (part 2 of 2) 10.0 points The wire has linear mass density of 13 . 4 g / m. Determine the wires tension. Correct answer: 87042 . 6 N. Explanation: Let : = 13 . 4 g / m . v = radicalBigg T T = v 2 = (0 . 0134 kg / m) (2548 . 67 m / s) 2 = 87042 . 6 N . keywords: 004 10.0 points A wave on a string is described by the wave function y = (0 . 1 m) sin[(0 . 5 rad / m) x (20 rad / s) t ] Determine the frequency of oscillation of a particular point at x = 2 . 0 m. Correct answer: 3 . 1831 Hz. Explanation: Let : = 20 rad / s . In fact, when a wave with frequency f trav els along a string, any point of the string has the same oscillation frequency f . In this case, f = 2 = 20 rad / s 2 = 3 . 1831 Hz keywords: 005 6.0 points The figure shows two wave pulses that are approaching each other. P Q Which of the following best shows the shape of the resultant pulse when the centers of the pulses, points P and Q , coincide? shah (rps587) HW 12 Kleinman (58225) 2 1. 2. correct 3. 4. 5. Explanation: Notice that the two pulses have the same width and amplitude. Choosing the the point P (the same as point Q when the two pulses coincide) as the origin, the two pulses can be described as: P : y 1 = A , d x d Q : y 2 = braceleftBigg A , d x < A , < x < d Using the principle of superposition, the re sultant pulse is y = y 1 + y 2 = braceleftbigg 2 A , d x < , < x < d P Q P + Q 006 8.0 points A pulse moves on a string at 1 m/s, traveling to the right. At point A , the string is tightly clamped and cannot move. 1 m/s 1 m A Which of the following shows how the string would look soon after 2 seconds?...
View
Full
Document
This note was uploaded on 04/29/2009 for the course PHY 58225 taught by Professor Klienman during the Spring '09 term at University of Texas at Austin.
 Spring '09
 KLIENMAN

Click to edit the document details