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Unformatted text preview: ' SAN DIEGO STATE PHYSICS 180A —Fall 2007
TEST 2: October 15, 2007 DIRECTIONS:
0 You need a narrow red SCANTRON FORM N0. F289PARL and a No. 2 pencil.  You may not use a pen to darken boxes on the SCANTRON form.
 No calculators, notes, or books are allowed. . .  All cell phones must be turned OFF. No earphones may be worn.  Make no stray marks on the SCANTRON form. ' I  All your bubbled responses must be dark and completely ﬁll the intended box.
 Make sure you completely erase any unintended bubbled responses. 1) Print your NAME on the top line of the SCANTRON form.
2) Next to SUBJECT,print Physics 180A « Leduc
3) Next to DATE, print " i 4) Enter your 9digit RED ID Number in the boxes under ID. NUMBER
and then darken the corresponding box under each numeral. 5) Darken the box under TEST FORM. 6) Leave EXAM NUMBER blank. Don’t ﬁll in any of the numbered boxes.
7) Do NOT turn this page or begin the test until you are told to do so. 8) Choose the one best response to each question and then darken the
corresponding box next to the question number on the” SCANTRON form.
You will only use Items 1 through 14 (on Side 1) for this Test. Hand in 
only your completed SCANTRON form when the Test is over. Only the
completed SCANTRON form will be scored. No credit will be given for ,
anything written on the test pages themselves. ° ' ' TEST FORM Questions 1 through 8 are worth 5 points each. 1. True or False? An object is projected from ground level with an initial speed of 60 mls, at an
elevation angle of 45°. Ignoring air resistance, when the object reaches the highest point in its parabolic path, its velocity is equal to zero. a A True
B False 2. True or False? The figure below shows a crate being pulled across a rough floor by two people, exerting forces F1 and F2. The force ka is the force of kinetic friction acting on
the crate while it slides. , h
v = 2 m/s ' a ‘5
<2: a. F2
[:1 ﬁt if the crate slides to the left in a straight line with a constant speed of 2 ml 3, then
F1 + F2 > ka. {in \.
m a) True 3 False 5‘ 3.? True or False? A box rests on the floor. The weight of the box and the normal force on the box,
i being equal but opposite forces, form an action/reaction pair. 4. True or False? An object is transported from the surface of the Earth to the surface of the moon.
The object’s mass on the moon will be the same as its mass on the Earth, but its ‘1 weight will be different.
39‘ True 3 False W
Physics 180A — Fall 2007 — Leduc — TEST 2: FORM A — page 1 of 5 True or False? While a golfer strikes a golf ball, the golf club is in contact with the ball for 0.05 s.
' During this brief time interval, the magnitude of the force exerted by the ball on the
club is equal to the magnitude of the force exerted by the club on the ball. ’ True
B False 6. True or False? A refrigerator that weighs 1000 N is at rest on the floor. The coefficients of static
friction and kinetic friction between the refrigerator and the floor are p5 = 0.4 and
yk = 0.2, respectively. If a worker exerts a 200 N horizontal push on the refrigerator, then the force of static friction on the refrigerator will be 400 N. w ‘1 r lg? True u
f B False it? v a?
"l ’i (‘r ( v
J ,. . f t " i .4" ‘r a . it _ r R ‘3 5.. g a 7. True or False? An object moves at constant speed in a circular path. The acceleration of the object
is zero, because the speed of the object is constant. 3. True or False? You are standing on a scale that is on the floor of an elevator. If the elevator is
accelerating downward at a rate of 2 m/sz, then the reading on the scale will be less than your weight. M
Physics 180A — Fall 2007 — Leduc — TEST 2'. FORM A  page 2 of 5 Questions 9 through 14 are worth 10 points each. Questions 9 and 10:
An object is projected from ground level with an initial speed of 80 mls at an elevation angle of 30°. Ignore air resistance.
9. How high does it go? "' A 80m
B 120 m
C 160 m
«D 240m . ‘1
E 480 In 1 Oh What is the object’s horizontal velocity 1 second after it reaches its highest point? A 20 mls _
9" «'P
B 40 mls i. a 1,1 , (’3 i3 “i Kg“)! ‘ we "‘f
C 50 mls tigé’ix [1 ,f 70 mls
. " , an”!
E 80 mls g) .r‘ :‘T; W
Physics 180A — Fall 2007 — Leduc — TEST 2: FORM A — page 3 of 5 11. The figure shows a block of mass m = 20 kg on a horizontal
surface. Given that FT = 200 N, sin 9 = 3/5, cos 9 = 4/5,
and the coefficient of kinetic friction is ﬂk = 0.25, what is the acceleration of the block? A 1.5 m/s2 ‘ s ‘ a:
l' 4' i.» ‘ “g:
‘3 3111/52 Th .1 ’13 r
C 5.5 m/s2 ‘  .4; U0 m
D 6.25 III/82 ‘
E 7m/s2 *’
4 l 0' lg”  \y
N '. 6 Q“ 1
i 4: 
“ [xi Q T 12, The figure shows a pair of boxes (m = 4 kg and M = 12 kg)
connected by a light cord that passes over a massless,
frictionless pulley. The incline angle is 30", and the surface
of the inclined plane is frictionless. What is the acceleration
of the boxes? 'A i3 one mS‘W‘G 17 ““———e— —v....A..._..i..._......”.... _ . J
B — .
328 4 wﬂ
9 I . .
c ‘1' “W I}: L
1" ; ... ‘ (“a
D %g i ..
f_ 2. vs 7 f
E gg w L! < 33.5 ) "’
6' l : M 1‘ Physics 180A —» Fall 2007 — Leduc — TEST 2: FORM A — page 4 of 5 EU
13. A simple pendulum consists of an object of weight 60 N attached
to a light string of length L = 5f) cm, the other end of which is
fastened to a point on the ceiling. The object swings in a circular
arc, and at the bottom of the arc, the object’s speed is mls. What is the tension in the string at this point? _ bottom of
A 12 N MASS ' wlmw circular arc
“ B 36 N "O
. l
c g: giant3:. /'H.
D 84 N t“
a,
:a _ 1 ..
J
r.
n,
1. "_ K 1.7,
(00 4r it? (2;...) 7‘5 ' kit? 7 {
l .
l at
14. A box of mass 9 kg is sliding down an inclined plane.
The incline angle is 60°. Find the acceleration of the box 6 if the coefficient of kinetic friction between the box and
the surface is pk = 0.34. it 2.0 m/s2 ‘ A 5.3 III/‘52 INA: “I; {a H v “'3 W I f ‘C 7.0 m/82
D 8.7 III/52 I
e a r to ' w, r. (QC ) END OF TEST
Physics 130A — Fall 2007 — Lcduc — TEST 2: FORM A — page 5 of 5 ...
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