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lab1991S

# lab1991S - \$olelms— Post Ola-or exemm PHYSICS 221 SPRING...

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Unformatted text preview: \$olelms— Post Ola-or exemm , / PHYSICS 221 - SPRING 1991 This laboratory final consists of 8 questions, each worth 2 points toward your total score for the course. 63. What is the distance between the jaws of the vernier caliper shown below? [I'm 1’1 I J2 '1‘: ' .u .m' ,'u E m1.“ﬂué'lﬂf"?r"{"'§"§l""£q:£:§q'£l“mu:WWW ”1.11111“; _ ' i 1 z 1 93123155 .1 ° 10 20 so £0 so so In so 90 '1 him on mam stae 1:1 ll[llllllhl‘lllI’IIII‘IIIII'Ill.”lzlll‘llllrwlil-IllIIIIILI . 0.2 mm 01". \jﬁfﬂifr m 13.9mm = 1.22.ch A) 12.2 cm B) 10.2 cm C) 1.02 cm 1)) 10.2 mm W @ 15400400 In the annual "Run for the Picnic Basket" race held each VEISHEA at Brookside Park, each ant who enters is observed to make a 14 cm long dash. A record of the run of one suéh contestant (known to his victims as Hooch) is shown below. starting line finish line The dots represent his position at 1 second intervals , with the race beginning att-O. 64. Estimate Mooch's instantaneous velocity at t = 7.5 s (in cm/s). A) 1.0 B) 0.5 C) 0.25 D) 0 Estimate Mooch’s instantaneous acceleration at t - 3.0 s (in cm/sz). A) o M C) 1.2 D) 0.2 E) 0.1 (A. TM-ztxsbsgli'lﬂ“: .11le5 65. Is " ‘: Cam/g 0‘5, VC3-533¢V(1+°3S TE— ! I "’ “W“- Warn \$1355.32: 315%“) Is I Physics 221 - Lab Final — Spring 1991 Page 66. If the result of a measurement of a distance is determined to be (in pm) 3 \$34.35 ,/- 360.,224 i 3,000 3.60 K 305 which of the following expresses the measured value in a form consistent with standard practice in the use of significant figures? (in these same units) (HINT: To avoid silly mistakes, first write the above in acceptable form; then look at the choices below!) A) 360 B) 3,602 0) 360,000 D) 300,000 m As available in lab, assume there are two heavy air pucks which can slide upon a smooth horizontal surface with little friction, leaving trails of spark marks, with each mark produced after a uniform interval of time. Assume these pucks are launched toward one another and collide, and that they are of egual mass. For each of the two records shown below, select the comment listed below which is most appropriate. A) The data must be invalid since clearly momentum is not conserved. B) The data must be invalid since the collision clearly is not elastic. C) The data looks ok, although the collision clearly is not elastic. D) The data looks ok; both momentum and mechanical energy appear to be ‘ conserved. E) For this case, one must know the time between sparks to make a definitive statement. NOTE: By the data being invalid is meant that, for the situation described, such data is impossible. If such data were obtained, then some large extraneous factor must be at work (such as hidden magnets, angels, etc.). Physics 221-- Lab Final - Spring 1991 . Page . . 69. Using apparatus like that which you used in Physics 221 lab, assume your technical assistant repeatedly measured the elapsed time for lg complete oscillations of a new timing mechanism for a grain sorter. ~ The results he reported to you are shown at the right. Given the situation as described, which of the following actions is the least wise (i.e., dumbest) way to proceed? </ A) Use 26.268 (the average of the first 4 runs) as the best value for the elapsed time for 10 ;> periods. 1‘ Use 31.509 (the average of all 5 runs) as the best value. K c> * / S / D) Ask him to make 1 more run (to replace run #5). } Ky E) Ask him to make 5 more runs, and to record the reading of the timer before as well as after, each run. ' Ask him to make 5 more runs (to study further the run to run variations). 70. The vane of an electroscope, such as you used in lab, is found to deflect 30° to the right of the vertical when a net charge of +10 nC is present on the insulated portion of the device. If now the device is discharged, and a net charge of ~10 n6 is transferred to the electroscope, what deflection will result? t? A) 30‘ to the left; opposite charges lead to opposite deflections. B) 30° to the left; unlike charges attract. C) no deflection; electroscopes only deflect one way. D) no deflection; electroscopes only work for + charges. 30° to the right; like charges repel. k— I‘f‘ [‘5‘ ‘er "reg“ 54‘0”. of 4%: s); dwaraes (+ or ——-) mHe Verh'cal SupPov'T and Vane “to Cduses % vane. 47: deﬂect. ' r \$97 4170“ 3 : , Cmsuxrg a 4L ﬁr ram 5' r’éPre’se”£‘ an “WSW" a? Clearlj \d,:vi:h}m. 40m %¢ don-‘ajegd‘F '%6 54141.93. runs. at 7 (@3544: ) H- ]ooKs /,:Ke EMF, ﬁ'ntr was N’L resc+ , I ) , ‘ bfw an runs 4 +5. ’ One :lwu/d /earn .7Lo c/ngmsi' all dd+¢)€.VC-y\ ones 0am . I . / . . ésPer—i‘L/lf/ when "unusual" Wucﬂm’ms’ are evident- @ ...
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