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lab1991F - Physics 221 — Fall 1991 Laboratory Final 63...

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Unformatted text preview: Physics 221 — Fall, 1991 Laboratory Final 63. What is the distance in cm between the jaws of the vernier caliper shown below? ’ main Scale: 15 MM ’,_ _. ‘ int»! .91 .02 .93 .u .m' .u' Uerm‘cv- 0:4 mm ahmml fill,“ ’gffl‘flllillllli} 'I '1 'I 'IE'IHn'l'l'I"x'l'l'fi'llx'g't'l'rllmmunwrva """‘—_— I 1 0 II I [III 2 3 £ 5 6 I 8 9 3 1 Z 3 l S 6 7 5 9 '1 2 U m 0 so 70 so 90 100 AS" a M llglfllllug;lurlllllllluj HIIHHIIHIIHHHIM : A) 13.6 B) 15.6 C) 1.50 m E) 1.60 64. The sequentially numbered spark marks shown below record the position of an object along a plane surface. These data were taken using a spark generator operating at 10.0 Hertz. Estimate from this information (if you can) the acceleration of the object? (in (mm/s)/s) ’ 7- 3 4' 5 a 7 9 9 I0 /’ fietjkbohm marks are Siilacé’d béié’i whifiiflt J - /4 cm? — J a A) 0.14 B) 14 D) The acceleration of this object is clearly not constant gar the intervals shown. E) There is insufficient information to estimate the acceleration. 65. In laboratory, the ballistic pendulum sketched at the right was used. In analyzing a typical event, the velocity of the ball and catcher immediately after the catch was used to deduce the velocity of .the ball immediately before the catch. . . k What phys1cal concepts and assumptions are u: used to derive this particular relationship only? A <::::)conservation of linear momentum during the catch. B) conservation of linear momentum during the swing and catch. C) conservation of mechanical energy and linear momentum during the catch. D) conservation of mechanical energy during the swing. E) conservation of mechanical energy during both the swing and catch. "mva = On:— MCDVI ball ca::her bud atofirqfifi'rzj $>refséawAb 2" ezl‘ .+¢ML yyufl‘5i*r1gyngh{+3 ((1‘57 66. Measurements-of physical quantities are often quickly repeated several <5 times, one after the other. Which of the following is HQ: a good reason for this practice? A) To look for some degree of reproducibility in the measurements, a characteristic that is expected in many physical systems. To determine the average of a number of measurements, for the purpose of reducin any error of constant value which is present in all the w- “my” C) To estimate the random uncertainty in each measurement. D) To determine the average of many measurements, because such averages typically have smaller random uncertainties than the corresponding individual measurements. E) To determine if the measurement fluctuations are consistent in size with the type of system being observed and instruments being used. Protractors 7 Susoension from two cells: After checking the "zero" of each cell, suspend the chain between the two cells. Hook the chain seat near the center of the chain so that it is off the ground. Each student should sit on the seat and have a colleague record the magnitude (cell reading) and direction (read the protractor) of the force exerted through each cell. To minimize parallax, read the ptotractors from a considerable distance. Read or estimate your data to a precision of 0.1 lbs and 0.1 degrees. Two cells, chain, seat and you Right Cell reading .. W Protractor reading 57.‘ As you did in lab, using the coordinate system shown above, analyze the data above to calculate a measured value for the X—component of R. (in lbs) D) 70.1 rom t e in ormation given. A) 136.2 B) 76.5 E) Cannot be determined f does not (adage. an error of £xecf glee s+enmfi r r14 r 71m Silt/Mi" Should [Ml/O M7724 1&7" 7%6 air“ 1 1716/6 was a $0" finger MM 32- Cm,(7770!‘¢ “it” .3 ‘f . t g 68. The following is a reproduction 0 some results from a student’s lab: iga “’7’- I For later reference, usea vernier caliper to measure the thickness of ‘ the shim you used. Also, measure the distance along the track between the leveling screw and the supports at the other end of the track; a two-meter long stick or rule should be available for this purpose. 1. shim thickness: distance along track between support points: 3&0 D Which of the following best characterizes a failure of this student, as reflected in the result for item #2 abova. A) The number of significant figures is inappropriate; B The student used inappropriate units; @fle student did not check his result to be sure it was reasonable; There is no problem with this student's result, E) None of the above statements apply. 69. [Using the rotating wheel apparatus such as you used in lab, a second disk is dropped concentrically upon the wheel as it is rotating freely. Which of the following graphs best represents the total an ular momentum, L, (wheel plus disk) versus time before, during, and after the disk is dropped? afiéular meme“ km (“a cmshngla 4 Q"?- ‘ \ appéaximafiwe} , + L A . pl. J. L 'C L D . I t; - bx, ' E1 [:4]: b; 70. An electrophorus is equipped with an insulating plate that becomes negatively . metal insulating charged when rubbed with a cat. Which of Plate handle the following best describes the charge on the metal plate of the electrophorus when W insulating it (the electrophorus) is operated I normally. 9 ate Electrophorus A) The charge is negative, because conduction from the insulator to the metal is the dominant effect. B) The charge is negative, because like charges repel. C)‘ The charge is negative, because the cat becomes positive. D) The charge is positive, because conduction from the insulator to the metal is the dominant effect. @The charge is positive, because unlike charges are attracted to the metal when it is momentarily connected to the ground. we flirt #16 ‘ § 'arjcd 5 [Mm/Wm. a ...
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lab1991F - Physics 221 — Fall 1991 Laboratory Final 63...

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