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PHYS_111_Hill_m87rich_Exam_3_Fall_2003

PHYS_111_Hill_m87rich_Exam_3_Fall_2003 - PHYSICS l l l EXAM...

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Unformatted text preview: PHYSICS l l l EXAM 3 FALL 2003 An object is vibrating on a spring with simple harmonic motion as shown in the figure to the right with a period of 2.0 s. The spring constant is 65 N/m. £fw-w‘n mythic; «arc-v!” .1. ,mb-Jym" rec—Luna». 37. What is the position of the object after 2.8 s? B. 3.2 cm c. 0 cm D. +3.2 cm E. +6.5 cm 38. What is the mass of the object“? A. 4.3 kg B. 4.8 kg C. 5.2 kg 11 5.9 kg m. 39. A certain tuning fork produces sound by vibrating at a frequency of 900 Hz. What is the wavelength of the sound produced? A. 32 cm C. 45 cm D. 50cm E. 55 cm 40. 41. 42. A circular hoop of steel of mass 500 g is pivoted at one end as shown in the figure to the right. It is displaced slightly from it's equilibrium position and undergoes small angle oscillations. What is the period for this oscillation? plva‘r ‘U’ A. 1.43 l | B. .6s I . I (m .. _. g __ D. 2.09. F I‘ V“ )1 E. 2.25 A “snapshot" of a sinusoidal wave as a function of position is shown to the right. What is the wavelength of the wave? gdul .4“ l T’/"\. "./\\ ,F —+ -‘t —+ —,¢'—1—\—>xm A. 2m [ 1“\ 3 liq- S G B. 3m '4 'L “'r' ' D. 5m E. 6m In a lecture demonstration a bell was ringing inside a sealed glassjar that had earlier been evacuated. A valve was opened to slowly let air into the jar. Which statement best describes what happened as the air entered the jar? A. Thesoundintensi incre -.., B. The sound intensity remained about the same. C. The sound intensity decreased. D. The sound frequency increased. E. The sound frequency decreased. 43. 44. 45. 46. A sound is measured at a point to have an intensity of leO'8 W/mz. What is the intensity level of the sound in decibels? A. 36 dB C. 57dB D. 68dB E. 79dB You are traveling at 25 111/3 (52 mph) in a 40 mph highway zone when you hear the siren of a police approaching you. The Speed of the police car is 30 m/s and the frequency of it's siren (at rest) is 600 Hz. What frequency do you hear for the siren? A. 570 Hz B. 600Hz C. 620 Hz U} m: D. 650Hz “JOLICE YOU [ C A string on a musical instrument has a mass of 1.20 g and a length of 50.0 cm and is placed under a tension of 200 N. If the string vibrates in it's third hannonic what is the frequency of the sound produced? A. 650 Hz B. 749 Hz D. 908 Hz E. 995 Hz An organ pipe open at both ends produces a standing wave With a frequency of 300 Hz. It is sounding it's second ham‘lonic. What is the length of the pipe? B. 1.86 m C. 2.15 m D. 2.87 m E. The second harmonic does not exist for an open pipe. 47. The glass shown to the right is filled with alcohol. Determine the pressure on the bottom of the glass due to the alcohol. A. 0.395x103pa B. 0.532x103 Pa c. 0.791x103 Pa m E. 1.3-x10 Pa 48. A log of cherry wood of mass 20.0 kg is floating in a river. What is the buoyant force on the log? A. 187N C. 205N D. 220 N E. Not enough information to solve problem. 49. Ifthe speed of flow of air past the lower surface of a thin wing is 125 m/s, what speed of flow over the upper surface of the wing is needed to produce a lift of 1000 Pa? A. 120n1/s B. 125 mfs C. 128 mfs dim E. 135 m/s 50. In a lecture demonstration compressed air was forced through a pipe of varying diameter as shown to the right. Small holes all of the same diameter were in the t0p of the pipe as shown. Ping-pong balls were placed so as to be supported by the air streams coming from the small holes. Which statement best describes the positions of the suspended ping-pong balls? A. The halls decreased in height from left to right. B. The halls increased in height from left to right. C. All balls were at the same height. D. Balls at points A and C were hi uer than those at points B and E. : = s at points A and C were lower than those at points B and D BALLS FLOATING- 1 l/ é-AIR CURRENTS flaw—9%” A 13 C: 17 51. The two dams are identical with the exception that the water reservoir behind dam A extends twice the horizontal distance behind it as that of dam B. Which one of the following statements regarding these dams is correct? A. The force exerted by the water on darn A is greater than that on dam B. B. The force exerted by the water on dam B is greater than that on dam A. C. Dam A is more likely to collapse than dam B if the water level rises. D. Dam B is more likely to collapse than darn A if the water level rises. . The n IS ce 0 e water e e 0 ms oes no e ermine e orce m. 52. The day time temperature recently in Ames has been typically around 50° F. The corresponding temperature on the Kelvin scale is? A. 10K B. 50K D. 313K E. 395K 53. A metal rod 1 m in length is heated from room temperature (20" C) to a temperature of 200° C. The new length of the rod is measured to be 1.0043 111. The rod is made of which metal? A. Iron B. Copper C. Brass E. Lead 54. A 2-dirnensional steel plate at room temperamre shown to the right is cooled by immersion in liquid nitrogen. The diameter of the hole ---- and the outside diameter of the plate -—-. L A. increases, increases 5 T E E B. increases, decreases C. decreases, increases D. decreases, . ecrease E. stays the same, decreases ...
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