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Unformatted text preview: So [whens ’Pa s‘t Physics 221 - Spring 1988 :W“a I Exa W\
Laboratory Final _ I This laboratory final Consists of 8 questions, each worth 1/2 point toward your
total score for the course. 87. What is the distance between the jaws of the vernier caliper shown below? ucu M .n I: .N .m' .u' A ' .
a; It“ I I :I"I”I”I'['I"'I"I'I‘f I'M“ I'“ i : Hi 'I'I'I Iflfllﬁiﬁllgrlﬁr I I I I I mm (Mam I 1 2 ‘ 5 7 l 5 HPIIII II' I'HI'IY IIIIII
£0123£561091 3 6092 2“ 61393123456 . |
i 10 20 30 III so II II I so so . m
g. i I '=|MININII1.1"”,‘vm'llIIIHHHIIIIIIIIu _ +‘ OI 2- mm (gem hot)
8 ‘,’.,,I.os...._~ " ,. a » O O
r: I. 52.9. cm
A. 12.2 cm B. 10.2 cm c. 1.02 cm D. 10.2 mm
o AXIM) v '
88. The sequentially numbered marks shown at the right “0;, (1“ all.
record the position of an ant every 10 seconds. #7, If on,
Which of the following best describes the motion of > g o 8
this ant, as near as one can tell? $3 ‘
A. The ant is in equilibrium. _. #4
B. The ant is moving with constant velocity. _ X
C. The ant is moving with constant acceleration. ‘3 A, 2,$
The ant is subject to an increasing net force as j ’3’
time goes by. ' E. Unlike blocks, ants are not subject to Newton's #5
laws . ‘F mantra“;
‘ 0 ;
89. In laboratory, the ballistic pendulum 1“ sketched at the right was used. In analyzing
a typical event, the distance h shown was
measured and used to deduce the velocity, v', /' ball catcher of the ball and catcher immediately after the ball
collision. What physical concepts and I / h ‘ /
assumptions are used to derive this "Ck ,
particularrelationship only? I I [ '——-‘ E
-W¢,.,SW r ) H J" “MU'I‘ TAG J"
‘1. "' a
A. conservation of linear momentum during the swing.
B. conservation of linear momentum during the swing and catch.
C. conservation of mechanical energy and linear momentum during the swing. q; conservation of mechanical energy during the swing.
. conservation of mechanical energy during both the swing and catch. Physics 221—888—Final
Page 90. Consider the collision of two identical hockey pucks on a smooth ice rink.
Assume that by analyzing the videotape of the collision, various but not all
components of the momenta of the two pucks before and after collision have
been determined and are recorded in the table below. Assume that there is negligible friction with the ice, but that the pucks
are soft and that considerable kinetic energy is "lost" in the collision. Under these assumptions, what is the value (if it can be determined) of the
entry marked with the c; Q ! .
EFEXTEKMAL :3 D "Q anL Cdné‘ﬂﬂ" Before collision After collision
Puck #1 Puck #2 Puck #1 Puck #2 "x" ? . annot be determined since the kinetic energy of the pucks was not
conserved during the collision. i ‘ .
I - 1.; E I
91. The motion of a flywheel is monitored by an j “m-fuﬂe;_bygkk~gngggggﬁdjgénbi
encoder which produces 200 pulses for each 3 ' ,; ; ‘L l n: .z- 1- i ' revolution. The wheel is allowed to gradually g °l.
slow down and stop; the number of pulses
produced in each succeeding one—second interval is plotted at the right. ' .'_.i_'_; . .: I
' ’ ' I
l What do these data suggest about the motion of
the flywheel? 'ﬁ;;.Ljnlgif”-,m A. Angular momentum is conserved.
B. Total mechanical energy is conserved.
<::§E9 The frictional torque is approximately constant. '
D. None of the above are true. 3 1 E A, E.’ All of the above (#1,2,3) are true. "-"‘” "m 7" w ' '"k”w*n_mh'éd'¥,
gnaw/ﬁr 45¢ 5'— 55” ’4 Physics 221—888-Fina1
Page 92. As was done in lab, the position, x, of one
edge of an air cart constrained by springs at
each end as shown is recorded as various masses are hung from a piece of tape attached to on ta e
and of the cart. ’ J: p position of ' total mass edge of car on end of tape
ire/2x mass I,
~ New ’é: AF 3 (@N‘EXQ'W’IS‘) x (0.412 -—0.32a)m
What is the effective spring constant (in SI units) of this system? B. 109 c. 9.2x1o'3 D. 0.94 E. 0.61 =/a065'/\//m 93. Using an electronic balance for which 2 M
the "zeroing" or "tare" control is (cm) (gm)
broken, the masses, M, of solid copper 1.00 18.96
cubes of various sizes (side length, z) 2.00 81.68
are determined. How should these data 3.00 251.92 be plotted to test whether the values of
mass vary sensibly (and perhaps also to 3 . ' A
extract some numerical property of the copper)? M: 4— N30 A. plot M vs. 9. ' _ [F f
B. lot 2 vs. M '
( C. plot M vs. 2.: D mauwa ‘é‘W‘é affor-
. plot M vs. 2 E. Either choice A' or B is equally suitable. M begﬁ linear ‘én 94. Measurements of physical quantities are often quickly repeated several
times, one after the other. Which of the following is not 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 systematic error that may be present.
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. End of Examination 33 ‘deﬁnihm)asjs+mr/fc error- is one, whfoh does 116* Shame 2.5 armasuremtnb poem/are
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