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Unformatted text preview: PHYS 1111, Section 5, Fall 2011 Test no. 3, version 1 V November 1, 2011 2:00pm  3:15pm ' \ E \7J N012? Warwmq/‘Zﬂmmcﬂoke [mt/am: IJe/‘tﬁepmmmwm MEI/(mm)
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TRUE/FALSE. Choose 'True' if the statement is true and 'False‘ if the statement is false. 1) When a rigid body rotates about a ﬁxed axis all the points in the body have the same tangential 1) E acceleration.
q‘é =' rd
A) True @
2) The net force acting on an object is equal to the rate of change of its momentum. 2) A I I B) False I F; 1976? MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. FIGURE 1
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3) You need to load a crate of mass m onto the bed of a truck. One possibility is to lift the crate 3) A straight up over a height 11, equal to height of the truck's bed. The work done in this case is
W 1. The other possibility is to slide the crate up the frictionless ramp of length L as shown in Figure 1. In this case you perform work W 2. What statement is true?
B) W 1 < W 2 kg 5‘ WC,
C) W 1 > W 2
D) No simple relationship exists between W 1 and W 2. .7: ”lab 4) A 0.200—kg mass attached to the end of a spring causes it to stretch vertically 5.0 cm. If another 4) 4 i
0.200—kg mass is added to the spring, the potential energy of the spring compared to the case with only the original mass will be K
Tk W2 ‘2'”51 0 B) the same. )( 2 M)»
C) one—half as much. i [A ( f 2 m ..
D) 3 times as much. ‘ K : Ii )1 ~ 2 X] E) twice as much. .' kX ._..,. .
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a, s WZ’zgji‘KZW w— n X; 8) An object of mass 2.00 kg starts at  5) An ordinary light bulb consumes 60 W of power. Through what height could a 1000N object be 5) lifted expending the same a t of power for 6 hours?
A) 360 m ) 1300 C) 720 m D) 650 m E) 430 m Pzﬂ. : m9 _ A: PAﬁ (60% 2(2’4005’) {2
At 2:; 9 mg z (00» “KLE
A6; éérsxgﬁuhxﬁff‘: 214005 6) A ball is tied to the end of an 80.0—cm string and swings in a vertical circle about a ﬁxed center 6) under the inﬂuence of gravity. The speed of the mass at the bottom of the swing is 6.00 m/ 5.
Which of the following statements is true? R V A) This question cannot be answered without knowin the tension wig; the strin . («Nahum mafenough energy to rea e top of the circle but the string becomes slack
before it can reach that oint. C) The ball does not have enough energy to reach the top of the circle.
D) This question cannot be answered without knowing the mass of the ball. E) The ball has enough energy to continue revolving in a complete vertical circle. 0’” .11 13> ——_ v L: rj u...» v}; #grtvﬁ 9‘7” “W 7’”? 775/7“
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7) A snowboarder coasts on a smooth track that uses from one level to another If the 7) I S snowboarder's initial speed is 4 m/ s, the snowboarder just makes it to the upper level and
comes to rest. With a slightly greater initial speed of 5 m/ s, the snowboarder is still moving to the right on the upper lev 's the snowboarder's ﬁnal speed in this case?
A)2m/s B)3m/s C)1m/s WP shown in Figure 2. If the work done by the force of friction is —150], what is the speed of the
object as it reaches the bottom of the inclined plane? Use g = 10.0 m/sZ. A) 20.0 m/s @ C) 150 m/s D) 10.0 m/s E)200 m/s . \/I, : 2<hqéli+w~¢ — 28k +2WC
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_; lﬂ/0)(ZO)2+ 2 450) I: IS 3" 9) An 8 kg object moving with an initial velocity of 4 m/ s comes to rest due to friction after it 9) f E
travels a horizontal distance of 10 m. If the initial speed of the object is doubled, what distance will i . 1 before coming to rest? Use g = 10 m/ s2.
B) 80m C) 10m D) 20111 E)30m
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10) A freight car moves along a frictionless level railroad track at) constant speed. The freight car is 10) B
open on top. A large load of coal 1s suddenly dumped into the car. What happens to the speed ofthefreightcar? 030 Conjqu‘lraa ail mumpmlum p ( PF
l Lmeszero
113—” «; m,\/II:(m,+Wr)\/F C) It' increases.
D) It remains the same. V; .1 F V” l v < v .
E) Cannot be determined from the information given. . m ff pa ’ I 11) An artillery shell explodes in midair and breaks up into many fragments. Which of the 11) A !
following statements are true regarding conditions immediately before and immediately after
the explosion:
I. The total momentum of the fragments is equal to the original momentum of the shell.
II. The total kinetic energy of the fragments is equal to the original kinetic energy of the shell. AW B) Statement II only
C) Bo tatement I and Statement/I D) Neither statement is true. k 7 0
R's pf but meckma 2mm“; ,2 0H (onSeIUe/ K ”0/ F B 12) A 3. 0— —kg object moves to the right at 4.0 m/ s. It collides headon with a 6. 0— —kg object/ moving to 12)
the left at 2.0 m / 3. Which statement IS correct? V \/
A) The total momentum both before and after the collision is 24 kg m/ 5. ® / _ 2 ML wumw B) The t6tal momentum 5 othbefore and W‘ﬂiéc 0111 SionYiéfo
C) The total momentum efore the collision is 0 kg  m/ s, and after the collision is 24 kg  m/ s.
D) The total momentum before the collision is 24 kg m/ s, and after the collision' is 0 kg  E) 361; of the above is true. ‘8: ml v; MLVL' :(3 l9>{4 [19"[5/(3)(23’— 6’; — P, L0
13) A plate falls vertically to the ﬂoor and breaks up into three pieces, which slide along the ﬂoor. 13)
Immediately after the impact, a ZOO—g piece moves along the xaxis with a speed of 2. 00 m/ s,a 235g piece moves along the yaxis with a speed of 1.50 m/ s. The third piece has a mass of 100
g. What is direction of the third piece with res ect to the positive xaxis (measuredc unter clockwise)? Considoy I’M/7W; UM Kong erwﬁéh ' 0" ”0 1’ / P/_ O
A) 41.40 )2210 c) 1390 D) 3190 E) 2210 .6 <2: ) __\
V; \7 [email protected]:. m,\/, my (039 so —7 Mil7V "’3ngth "0
9 ' Vz—mzﬁ[email protected] :0 9 M) V1,:m3l/SMLQ {9 (’9 V3 JNIJL @ bag 14) In a particle accelerator, protons are ﬁred at a stationary target and collide elastically with the 14) 4:
nuclei of the atoms in the target. In one such experiment, a beam of protons is ﬁred with a speed of 2.10 x 107 m/ s The protons that undergo a collision rebound with a speed of 1.68 x 107 m/ 5.
What IS the mass of the nuclei that the protons are colliding against aswng a one'dLmenSiﬂnngF’llision? l/ 4 2,“), I 71:4") Pl“ Vg 7h”
Qgplbton “m5 (77h5(:2/a’/‘0H of I’M/”NI 7‘ W J;
S 0 9, proton masses M V)” Vf I I .441
C) 8.00 proton masses VS h/— W /1 \/, / I 7.7 + In} 77 ‘ W” L
D) 10.0 proton masses ﬂ”: / I ’ m (I _ \/f/
E) 7.00 proton masses M, 14'"; m C E ‘l’ I) : / 7,7
W Vi/ ’ V” 0"" @ 90 143 (m rm.) ”rm "1}. 0“ KT”): ﬁhﬂﬂ'
1%,: ’"’ V” I ’“I "YT—T % C
i}? I! (/+ £3”) MPIS) Three masses are located in the x—y plane as follows: a mass of 4 kg 15 located at (0 m, 0 m),a mass of 2 kg' 1S located at (3 m, 0 m), and a mass of 6 kg 18 located at (0 m, 3 m). Where 1s the
center of mass of the system? ’38::32‘31) Nmsws 04 (2202—40 W__ ,6” ,1 ”W .5m,1m) : Mmmvemg 4 +Z+é —
E)(2m,1m)
.: M,‘1, +419 7» my 7;“, 0 4. 5+ 43/ NEW 3) W: VII+VQI+U$
x :,&(9 +54 4009+(4 Oi
Aug}. 53 Position (m) 2 4 16) An object is under the inﬂuence of a force as represented by the force vs. position graph 1n
Figure 3. What is the work done as the object moves from 2 m to 6 m? A)40] B)7OJ C)0] D)3OI
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5» (f40"(:3_,i' I f)_ l//,4 17) A child is riding a merry—go—round which completes one revolution every 8. 36 s. The child is 17) A l j
standing 4. 65 m from the center of the merry— go—round. What IS the tangential speed of the 1% VetMrgrzn: (MTMPW :1?
ms ’ 3 C)1.75m/s U_7.;T 8, 363
D) 0.556m/s g"
E)5.64m/s I OK / or
18) A child is riding a merrygoround, hich has an instantaneous angular speed of 1.25 rad / s 18) (4 and an angular acceleration of 0.745 rad /52. The child is standing 4. m from the center of the
merry —go—round. What angle does the acceleration of the child maQrith the tangential
direction? r‘ 6% B) 90.0° C) 45.0° D) 255° E) 32. 5° "> Z.
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Veal/M Afrgﬁ 0743 19) A Ferris wheel with a radius of 8. 00 m rotates at a constant rate, completing one revolution in
30. 0 5. What IS the apparent weight of a 60. O—kg passenger when she 18 at the top of the wheel? B) 325 N C) 588 N D) 432 N E) 610 N N 36; Mr Vfcmrzzzr
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:60 we ‘47:“) @ 20) A discus thrower starts from rest and begins to rotate with a constant angular acceleration of 2./ 2 rad /52. How many revolutions does it take for the discus thrower' s angular speed to reach 613
‘f—rN rad/s?
A) 9.5 rev 2 0 B) 6.5 rev C) 1.4 re D) 3.0 rev E) 9.0 rev
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