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Unformatted text preview: 5ogu‘rtoaus PH 1110 C Term 2008 Exam 3. Name Section Number la. [10 pts] Consider a cart on a track1 as in the sketch on the leﬁ below. On the rectangle on the right,
please draw vectors representing the forces acting on the cart moving with both velocity and
acceleration down the slope, making sure to label the forces clearly. Friction acts with a friction coefﬁcient of n. The other known variables are me, g, s, and 6. (All of your answers should be in
terms of these variables.) Q
i“ N Q A mag Experimental set—up Cart moving down the slope 1b. [10 pts] Calculate the work done by each force that you drew in a) as the cart moves down the slope a
distance 3. WM :0 :?09)
was s + Maj and 5’ We ' f.§5.€.r*+"’$..=.fiMeﬁ “7’” lo. [10 pts] What is the gravitational potential energy change when the cart moves down the slope at
distance s? ‘ '.l'd'. [10 pts] What is the kinetic energy change‘when the cart moves down the slope a distance 5? waﬁL : MCCDSMG'S IvaCjC‘acaa s
' :AK ' ' 1e. [10 ptsj Predict the Speed of the cart after a distance 5, assuming that at the beginning of the
experiment, it was moving with a speed vi. 2. . “r AK ; sin/'6'“: __£Mauaz ,_.._I mccbsm 95“ IMM¢aCa‘JQS‘ II . .L
Viﬁl':2L 4 .2 $1465 ~QM Chas‘16. '
.4 L  '_ J IVf? f .2 I ' ' _ Points earned on this page: PH 1110 C Term 2008 Exam 3.. Name Section Number 2a. [5 pts] You throw a ball of clay (m = 100 g) at your little sister, who is standing motionless on a
hilltop. The moment before the ball hits her back, the hall has velocity vb = (4.00 i + 1.00 j) m/s. The ball sticks to her back, although does not hurt her or knock her over. What is the impulse (a vector)
that the baitljgceived from yog sister‘s Eek? Jn‘bq“ : MU; _ “"Va A , : A
ﬁlm ivicgrg413 )m oriookj “‘2‘ ... ... 00" wt), 501» was
3mm ‘ My “ 11 J (“0300A ~01003)N 3 2b. [5 pts] what E116 impulse (a vectornhbat her back received from the ball? 3m I; _ bad/1
.A ' A)
Jballnnback= 0 . L + O: “‘ 3
20. [5 pts] What is the work done on the ball by the back? ' '
': J— mv 2 —— 1‘ iii/[v.1
worm Ina M '2’ .g‘ Z 6 “eggo 5 'v;'='"(+"+ﬁ)“‘ = ﬁrm/s W'Or’we w ‘L ( )2
.. .z .. 0.! \17 '—*
m [051” Z ' 7 Whackonball= "h 0' d r 2d. [5 pts] And what is the Work done on the back by the ball? we to; :0 (but. JW'WLM) Wbau an bask I: r ,3 _ ' 7 Points earned on this page: _ PH 1110 C Term 2008 Exam 3. Name Section Number 3a. [5 pts] Two skiers collide on a ﬂat icy patch of snow. Skier A, of mass mA = 60.0 kg, has initial
velocity VA 2 (6.00 i — 10.0 j) m/s. Skier B, of mass m; a 100 kg, has initial velocity VB = (— 4.00 i
+2.00 j )m/s. They collide, their skis become entangled, and they slide (no friction) together. What is
their momentum after the collision?
N 'Q ._‘3 _ “*3 .— s'\.
E 5 MAVA ’ 3“): »—b003 " a. ,,.__..._l A A l
P3 amﬁve .— 4005 +30%} N ?
745 9.4 v3 fem :P‘?+1P8 3b. [15 pts] Sketch the momentum vectors on the graph, labeling them, and making sure to label and scale
the axes. There will be three vectors: one each for the skiers before the collision, [1A and p3, and one
for both skiers, pita, after the collision. What is the (a vector) 2'; A on B? And B on A? 30. [1th$] ‘43. I
l 7 I _ Pe+3 .:_(mi0r+ My) V4“ ' r l '   I " Jinan? .
7‘ a 'Mb'f ‘mﬁvﬁ 1 ;n). ::_ _ _ _ a zaolaozsi‘ ~—; 22)“)“006‘9‘ *ZJ 7 _' _ .
a." 375: 945—03 “'5' N V l
A r ' I A _ ' '4 . Points camed on this page: _
En A ‘ "“ " me ' . _ ...
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 Spring '08
 Keil

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