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Unformatted text preview: Physics 221Spring 1985
Laboratory Final This laboratory final consists of 8 questions, each worth 1/2 point toward your
total score for the course. I 87. What is the distance between the jaws of the vernier caliper shown below? main $<Lal6 ngqmm
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B. 32.7 cm C. 60.7mm D. 3.027 cm E. 3.1 cm 88. The sequentially numbered spark marks shown at
the right record the position of an object;
these data were taken using a spark generator
operating at 10 Hertz. What was the magnitude
of the average velocity (in cm/s) of the object
while it traveled the interval from mark #1 to 15400100 mark #6?
A. 7.5 B. 9.0 C. 4.5
D. 10.0 E. O w ’0! “S V
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/U“ '3 ‘_"' z: ' :3 ‘v L/nw S ': sﬂ%ﬁE Physics 221885Final
Page 89. Two metallic electrodes, located at x = 2 cm
and x = +2 cm, are held by wire connections at
electric potentials of 0 and 4 volts, .
respectively. For the coordinate system shown, .A ,AV to“
which of the following expressions most nearly »f “‘“W‘ ““' 33 ,p”
represents the electric potential, V(x,y), in ‘
the air between the plates? (Assume units of
volts and cm for V and x, respectively.) A_ V = x—z B. V = (x+2)2/4
c. v = 2 D. v = x : hm) am x dampen + 90. A piece of dry ice can slide with little friction on the surface shown.
Assume the dry ice is released at various points corresponding to different values of h with the resulting final velocity v along the level lower
surface measured in each case as shown below. h v
(cm) (cm/s)
5 99 __
10 140
15 171 How w0uld you plot this data to test the predictions of Newton's laws and
perhaps extract a value for the local acceleration due to gravity? A. plot v versus h .Lm‘u'ﬂ‘ 1: W3 A!“
B. plot v versus h2 3‘ 7 k
C. plot h versus v f71' = Q. A
(E) plot v versus v’h "yr: ‘3 .5 C W; WC: “3:
E. It really does not matter much; any of the a ove plots would be equally
useful. 91. Using the rotating wheel apparatus such as you used in lab, 3 second disk is
dropped concentrically upon the wheel as it is rotating freely. Which of
the following graphs best represents the angular velocity of the wheel vs.
tﬁne before, during, and after the disk is dropped? u) Lb .. A U) B (D C. k) (::::> E: Physics 221885Final
page 92. @773 A large gold fish from Lake LaVerne is
suspended from two load cells as shown. If
the left cell reads 50 lbs, what can you say
about the reading of the right cell? (Assume
the cells have been "zeroed" properly.) cannot say without knowing the weight of the fish.
cannot say without knowing the weight of the chair,
chain and fish. it should be about 71 lbs.
it should be about 35 lbs.
it should be about 50 lbs. A.
B E. 93. 94. vm=0wagxgmgov> : 50 am)... foQ €02?) (M\S®=—32. 27: —3") Wk . END
'PKT : (+50—3QB‘3 H C/mls A chair with small wheels is free to
oscillate back and forth with little
friction. The period, T, is expected to be
related to the total mass, M, of the chair and its contents by the relation
\
“[1 Sir— [NJ/bk 33'.
Representative data and a line drawn to 5'. I 2mm“. 1 K” ‘/7. represent the trend of the points, are 3' T: plotted in the graph at the right. What st: 777 .1)
value of the spring constant, K, is tﬂ/7, ,5
indicated by this data? (in N/m) ¥< * (3n? 2' f‘ (:A. 990) B. 0.20 c. 31 D. 5.0'
. The graph shown is not useful for determining K. , 2.
K: sir/0428]}: "L Consider two air pucks, each with a mass
of 1.0 kg, that collide on a glass . 300
surface such as used in lab. If the spark marks left after the Collision by 
the Spark generator operating at 100 Hz are as shown at the right, what is the ’ .x component of the total momentum of the —*r————
two pucks after the collision (in Kg'cm/s)
A. +50 c. D. +89 ‘ E. 0 39 ...
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This note was uploaded on 03/26/2008 for the course PHYS 221 taught by Professor Herrerasiklody during the Spring '08 term at Iowa State.
 Spring '08
 HerreraSiklody

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