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Unformatted text preview: —) .
3) The vectors A , and E are shown. The vector sum of these three vectors ls §= X+ﬁ+6 What is the value of 8);, the xcomponent of g? ' l i ' ' \ 7
_ . A!) l ‘ ‘1—.  \\\_*' i )7
. . . .c. _ 2 _’ L if)
\) v k 1, 1
_ C,
A) 3 B) +3 C) +2 D) —2 E} ~4 —> —>
4) The components of vectors A and B are given as follows: s as, w »
Ay = —6 By = —3.4 s ,  l) «c i053 , 1‘ if 2 > —>
The magnitude of the vector difference B — A, is closest to: A) 11 B)5.1 C) 10 D)5.2 E) 110 5) Quantity a, b, c, and d are quantities with physical dimensions. They are
related by the equation d = Kabc, where K is a dimensionless quantity. What
is a dimensionless combination of the dimensional quantities above? A) l/abc B) dabc C) abc D) da/bc E) d/(abc) \L l 6) A person on a diet loses 1.1 kg in a week. How many
micrograms/ second (pg/ 5) are lost? A)4.4 x 104 ug/s B) 1.1 x 105 lag/s
C) 1.8 x 103 ug/s D)30 ug/s 7) In a cerain system of units, 37‘st1fetihes equal 1 meter, a snatch is 67 seconds,
and a bander is 27 kilograms. How many banderstretches per snatch squared are there in 80 Newtons, where 1 Newton equals 1 kgm/ 52 A)1.8 x101 B)2.0 x 106 gm,» \ (I [\1  .2.“ U \ ﬂ 15—74 " 103 35%;“ P if [a ’ ‘ '9 —> 8) The components of vectors B and C are given as follows: TB" : (—EA ,—4k.7> 2 8.1 Cx 5: “63 a; : <F {C ’5 'L\> .
By = 4.7 cy = +5.4 C 4 ‘8 e»
—)'. —) '—.:—‘—
The angle (less than 180 degrees) between vectorggfizand C, in degtggf‘fg’ J5
closest to: A) 10 B) 71 C) 170 D) 109 E) 81 B a C :11“ s “
‘ﬁ_'?7't*a.&'_'> " . 
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5.33:: 4:31:17 571’. 6 s“
25‘}? page—3 Physics 2A, Mechanics H— Fall 2006 instructor: B. Grinstein
Quiz it 2 INSTRUCTIONS: Fill, tear and return the bottom strip of the front page with your scantron. Keep the top portion of the front page and the rest of the quiz. Use a pencil #2 to ﬁll your scantron. Write your
code number and bubble it in under "EXAM NUMBER". Bubble in the quiz form (see letter A——H at bottom of page) in your scantron under "TEST FORM"
1} Which of the following situations is impossible? u "
A) An object has constant non—zero acceleration and changing velocity. @n object has constant non—zero velocity and changing acceleration. __—_
C) An object has velocity directed east and acceleration directed west.
13) An object has zero velocity but nonzero acceleration. E) An object has velocity directed east and acceleration directed east. 2) An object has a velocity directed to the right, and an acceleration directed to
the left. Which statement is true? A) The position of the object is increasing to the left with time, and its speed
is increasing. B) The position of the object is increasing to the right with time, and its
Speed is decreasing.
C) The position of the object is not changing in time. o) The position of the object is increasing to the right with time, and its
speed is increasing. Vr——? é. q Figure 2.1 t 3) Shown in Figure 2.1 is a schematic graph of position versus time for two
moving objects. Which of the following best describes what is depicted here?
A] A Speeder races past a parked police car. A moment later the police car
starts and takes off in pursuit with high acceleration and siren
screaming. He ends up giving the violator a speeding ticket.
ﬁfLeading the Indianapolis 500, with two laps to go, Bobby Rahal throws a
wheel bearing and pulls in for a pit stop as Tom Sneva zooms by and oes on to win.
g, X: ball is thrown into the air and a moment later a second ball is thrown,
' but with a higher velocity than the first.
D) While accelerating in an attempt to pass, Mario Andretti plows into the
back of a speeding AJ. Foyt on the back straightaway at the Indy 500.
If A rock and a crumpled piece of paper are dropped from rest at t = 0 in
the presence of air (i.e. friction is present). ., ﬁ' 4) A graph of velocity as a function of time is shown below. The vertical axis
has velocity measured in meters per second (each square is 1 m / s) and the
horizontal axis is time in units of seconds (each square is 1 5). During which time interval could the object be possibly moving with nonzero constant
acceleration? A) 4.1 s to 5.9 s
B) 6.1 s to 7.9 s C) 0.1 s to 1.9 5 9:)
D) 2.1 s to 3.9 s
13) There is no interval that is consistent with constant nonzero a _
acceleration. #—
ro k 5) Human reaction times are worsened by alcohol. WI would a
drunk driver's car travel before he hits the brakes than a sober driver's car? Assume both cars are initially traveling at 50.0 mi/ h, the sober driver takes
.33 s and the drunk driver takes 1.0 s to hit the brakes in a crisis. A) 59 ft B) 34 ft @49 ft o) 54 ft 6) A child standing on a bridge throws a rock straight up. The rock leaves the
child‘s hand at t = 0. Which of the graphs shown here best represents the veloci of the stone as a function of time?
EAil " V l page3 B) C}
D
J v \Sﬂ;}\ (C}\ I}
k—T \% C\ *5 / C3“ 4:;
V§Jﬁxqo
1:) . CL,» hf")wa 45¢
v Q 9 : {*lo"’/\/§c X10
t onJ\ {E;f;f\E' *9 itaﬂscx
cob 7} At object starts moving at t = 0, and its position is given by x =bt3 — Ctz. At
what time (other than t = 0) is the instantaneous velocity equal to the average
velocity? Assume b = 4.2 111/53 and C = 1.8 m /52. A) 0.26 s B)0.21 5‘ (30.15 s o) 0.19 s
2 ’C 3‘:
v: 30*: zd: : m mt" “C Gob
a: ,ﬂ at" 1'
X 3x08 not : (owe «1c aw} w '20—. ﬁ‘ob£ 42¢ . o page4 8) A graph of position as a function of time is shown below. The vertical axis
has position measured in meters (each square is 1 m) and the horizontal axis
is time in units of seconds (each square is 1 5). During which time interval
could the object be possibly moving with nonwzero constant acceleration? A) 6.1 s to 7.9 s B) 0.1 s to 1.9 s C) 4.1 s to 5.9 s D) 2.1 s to 3.9 s E) There is no interval that is consistent with constant non—zero
acceleration. \l 9) At the same moment, one rock is dropped and one is thrown downward with
an initial velocity of 17 m/ s from the top of a 300 mbuilding. How much
earlier does the thrown rock strike the ground? 0 :SCD Jr 0 JP ’0'). A)1._5"S
B)1.4"s \ j 2
01.1.5 9‘ ’ 5°" '* WC T 195 D) They land at exactly the same time. D;3C>D+u+:;(a)b l
O as, 171,4. W; O Physics 2A, Mechanics —— Fall 2006 Instructor: B. Grinstein
Quiz it 3 INSTRUCTIONS: Fill, tear and return the bottom strip of the front page with your scantrOn. Keep the top portion of the front page and the rest of the quiz. Use a pencil #2 to fill your scantron. Write your
code number and bubble it in under “EXAM NUMBER”. Bubble in the quiz form (see letter A——H at bottom of page) in your scantron under "TEST FORM“ ...a at _
17a. "Ft“MP ’ M”, '
f: .p ' (35$ L” 11.1} 1) W at conditions are sufﬁcient for the path of an object to be curved? «ADCUHg
mace—— / ﬂThe object has different x— and y—components of acceleration. f
L‘s fr ﬁrmﬂblecmmcmmaﬁiﬁerentdirect‘ionthan'its velocity. f’
H / ﬁ/QTThe object has am at;  I . . . _ I ' ) ' \
. 4 f1 D The object haacceleration. a V (N a; _ ,
d K \‘r HM“ . jet—M E) either set of conditions A or D d #‘ O:\J£ 2) You drop a basketball from a plane flying horizontally at a constant speeg in line. Neglecting the effect or air drag, the package will g c, I? A) it depends on how fast the planes is moving _ f '
ﬁremian vertically bellow the plane while falling : 3 “Effirﬂuj.
C) lag behind the plane while falling #9.; '0 ﬁnot fallat all
ﬁmove ahead of the plane while falling ‘27
3) A long distance swimmer is able to swim through still water at 4 km / h. She wishes to try
to swim from Port Angeles, WA due north to Victoria, B.C., a distance of 50 km. An ocean current ﬂows through the Strait of Juan de Fuca from west to east at 3 1011/ h. In what
direction should she swim to make the crossing along a straight line between the two cities? Q ﬁx 3 A) 37" east of north  v K i H (Eire“=1 B) 41° west of north KL _ _. 8'0 \Zy ._a '3 ; 5L Sh
est of north \__ a C L D) 37" west of north . .3 E) 41° east of north 4) Which of the following is an accurate statement?
A) All points on a rotating disk have the same angular velocity. B) All points on a rotating disk experience the same radial acceleration. C) All points on a rotating disk have the same linear Speed. ﬂ
D) All points on a car tire have zero acceleration if the car is moving with constant /_ P linear velocity. _ {\r E) There are at least two points on a rotating disk where the vector sum of the __ ///_
[2’ ' tangential acceleration and the centripetal acceleration is zero. l 'r'. 1__ "fa'5) Two particles, A and B, are in uniform circular motion about a common center with the
_ same radial acceleration. Particle A moves in a circle of 2.6 m radius with a period of 7.3 5. Particle B moves with a speed of 1.0 m/ s. The period of the motion of particle B is ‘ f
1") closest to: W a 245W]. {x ® A) 3.7 s 434% B) 3.1 s C) 3.5 5 CK D) 2.8 s A H3 E) 3.3 s \ . r
L.
/ _,/\ ’\ ha :znﬁl 54/5 _—: [ 1., . “M
ﬂap) The x and ycoordinates of a particle in motion, as functions of time t, are given by: “f J) “° ‘— x(t) = 4t2 — 5t + 6 y(t) : 2t3  3t2 — 12r —9
U5 The x— and y—components of the average velocity, in the interval from t = 0.0 s to t = 5.7 8, lb 33
are closest to: 1
r} A)vX=40.6m/s,vy=148.74m/s , O STE, E: = :‘L
g 3) Vx = / 5, vy =é5i498 111/ s '   «Y C) vX=—17.8m/s, vy =35.ss rn/s 9/ VX = m/S; V}; = I'll/S "Lg '
E)Vx=19 m/S,Vy=34 m/s 7) A projectile is ﬁred at time t = 0.0s, from point 0 at the edge of a cliff, with initial velocity
components of vex = 40 m/ s and voy : 700 m/ s. The projectile rises, then falls into the sea at point P. The time of flight of the projectile is 175.0 s. A area: +
\”=C©v‘=‘) v0x=40 m/s {
*{j . (40,7013) voy=momls %
Li“ CD?!) x=©t 40E ,— “b
scot’loo Ci
\{ w 3 i, (—13—) In the ﬁgure, the x—coordinate of the projectile when its y—component oquals 560 m/ s is closest to:
A) 520 m B) 600 m C) 540 m D) 570 m E) 490 m 8) The velocity of object A and object B relative to the ground are perpendicular to each
other. Which statement is true regarding the magnitude of the relative velocity of object
A to object B?
A) The magnitude of the relative velocity of A to B is equal to sum of the Speeds of A
and B relative to the ground.
B) The magnitude of the relative velocity of A to B is greater than the Speed of either A
or B relative to the ground.
C) The magnitude of the relative velocity of A to B is equal to difference of the speeds
of A and B relative to the ground. Wm'ge,of»the relative velocity of A to B is less than the speed of either A or
B rel we I e ground.
E) The magnitude of the relative velocity of A to B is equal to average of the speed of
A and B relative to the ground. sax T C1 .2 H}
30
mew—a
1F” _.:9
Vii/'3 L \j‘ij
Q A ““ a
\O/ Fro/c4
VHYQ ,._‘>
\. page—3 _m___________________._————————=W Physics 2A, Mechanics  Fall 2006 Instructor: B. Grinstein
Quiz # 4 top portion of the front page and the rest of the quiz. Use a pencil #2 to ﬁll your scantron. Write your
code number and bubble it in under "EXAM NUMBER". Bubble in the quiz form (see letter AH at
bottom of page) in your scantron under "TEST FORM"
N
‘N E
S
1) Two forces act on a 4.00kg object in a manner that the object has an acceleration 3.00 I. , ml 52 in a direction 20.0° north of east. The ﬁrst force is 15.00 N in a direction 100" west . ‘5 f rth. What is the d force? cp\
. I P X), o no secon E n .
“Hm{é A) 14.6 N in a direction 28.1° south of east / A 59*}
' “7.) “ ‘3 B) 17.5 N in a direction 375° south of east an a L’
/ g xqiv
/ C) 16.2 N in a direction 302" south of east ‘ q °° “‘8 ‘
/ J. a; ‘7 D) 12.9 N in a direction 28.1° south of east 4,1.“ M4511) + U 31) \ ‘/ 'q.$) 18.8 N in a direction 41.1° south of east 33
~ a“? “1’5 I . 2 «2 .g’ ‘5‘ V\' 'A%~\st\w§‘*°r ‘ < 1’4"“) ' ‘ ' ’
__ w'  . f w) W
\ JD 1 trims \‘6 M"! u“ ““ ‘° (7' s,
' \ ‘ . . A person pulls on a 6.00kg crate, which in turn is connected to a 4.00kg crate by a light
rope. The light rope remains taut. Compared to the 6.00kg crate, the lighter 4.00kg
crate: A) is subjected to the same net force and has a smaller acceleration B) is subjected to the same netcﬁnceband has the same acceleration @s subjected to a smaller net force and has the same acceleration
D) is subjected to a smaller net force and has a smaller acceleration
E) none of the above 8.3 W: “‘3 3) A block is on a frictionless table, on earth. The block accelerates at 8.4 m/ 52 when a 70 N
horizontal force is applied to it. The block and table are set up on the moon. The acceleration due to gravity at the surface of the moon is 1.62 m/sz. A horizontal force of
QWON '— Mk3 9‘) 35 N is applied to the block when it is on the moon. The acceleration imparted to the
block is closest to: 3?” , A)4.6 m/s2 B) 4.2 rn/s2 C) 5.5 m/s2 D).3.8m/s2 E)5.0m/s2 4) The ﬁgure shows an acceleration—versusforce graph for three objects pulled by rubber
bands. The mass of object 2 is 23 kg. What are the masses of objects 1 and 3? 7o
’3 I 2 —9 c
’ ./\lv+ ‘5 5E1 13 Q
l E“: (a = Maw)
90‘ E 3a.
Q ’ 3
2a!
1:11
0
0 l 2 3 4 5 6
Pace (unmba ofmbhcr bands)
A) 46 kg and 12 kg _ B) 58 kg and 12 kg
C) 9.2 kg and 46 kg D) 9.2 kg and 58 kg 5) A 60.0kg person moves a 30.0kg box by pushing on it in a direction 25.0° below
horizontal as shown in the diagram. There is no friction between the box and the ﬂoor,
but there is friction between the person's shoes and the ﬂoor. If the box and the person accelerate at 2.00 m/ 32, what is the ma ' de of the horizontal frictional force of the
ﬂoor on on the person's shoes? w o 0‘
. go 0%
W0 we 9*
A) 589 N B) 180 N C) 120 N D) 60.0 N E) 240 N Figure 4.1
V
E Patl E
GD 6) In Figure 4.1, a 10 kg mass is suspended from two spring scales, each of which has negligible weight. Thus
/A¥l’he lower scale will read zero, the top scale will read 10 kg. ach scale will read 5 kg.
C) The top scale will read zero, the lower scale will read 10 kg.
D) EaEscale will show a reading between one and 10 kg, such that the sum of the two is 1 g. However, exact readings cannot be determined without more information.
E) No of these is true.
T = was) a
7,4“ TL = m T2618»: ...
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