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Unformatted text preview: lim (kl9356) Practice Problems 2 Weathers (17104) 1 This print-out should have 36 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 (part 1 of 3) 10.0 points You dip your finger into a pan of water twice each second, producing waves with crests that are separated by 0 . 18 m. Determine the frequency of these water waves. Answer in units of Hz. 002 (part 2 of 3) 10.0 points Determine the period of these water waves. Answer in units of s. 003 (part 3 of 3) 10.0 points Determine the speed of these water waves. Answer in units of m / s. 004 10.0 points The distance between two successive crests of a certain transverse wave is 1 . 31 m. Eight crests pass a given point along the direction of travel every 15 . 1 s. Calculate the wave speed. Answer in units of m / s. 005 10.0 points Earthquakes produce two kinds of seismic waves: The longitudinal primary waves (called P waves) and the transverse secondary waves (called S waves). Both S waves and P waves travel through Earths crust and mantle, but at different speeds; the P waves are always faster than the S waves, but their exact speeds depend on depth and location. For the pur- pose of this exercise, we assume the P waves speed to be v P = 8990 m / s while the S waves travel at a slower speed of v S = 5320 m / s. Suppose a seismic station detects a P wave and then t = 87 . 9 s later detects an S wave. How far away is the earthquake center? An- swer in units of km. 006 10.0 points A wave is sent along a long spring by mov- ing the left end rapidly to the right and keep- ing it there. The figure shows the wave pulse at QR - part RS of the long spring is as yet undisturbed. P S P Q R S Which of the graphs correctly shows the relation between the original position x of each point of the spring and the corresponding displacement x of that point? (Displacements to the right are positive.) 1. x x 2. x x 3. x x 4. None of these graphs is correct. 5. x x 6. lim (kl9356) Practice Problems 2 Weathers (17104) 2 x x 7. x x 007 (part 1 of 3) 10.0 points A transverse wave of frequency 50 Hz propa- gates down a string. Two points 30 cm apart are out of phase by 3 4 . What is the wave length of the wave? An- swer in units of cm. 008 (part 2 of 3) 10.0 points At a given point, what is the phase difference (as a multiple of ) between two displace- ments for times 7 . 5 ms apart? Answer in units of ....
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- Fall '08