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Unformatted text preview: Sample M ioléerm g oluﬁion Part I: Multiplechoice questions (40 marks) This part consists of 8 multiplechoice questions. Please read each question carefully and
circle the correct answer. Each correctly answered question is worth 5 marks. No
partial credit is given for this part of the exam. 1. A car travels the first 100 m with a speed of 10.0 m/s. It then travels the next 100
m with a speed of 20.0 m/s. What is its average speed? 7’laléinm is
13.3m/s 0 l 0
b 15.0m/s t = '00“ + 0 m = léO 5
c. 16.7 m/s 10.0 m/s 2 0  0 n /s
(1. 17mm _
e. 18.0m/s $ 0 = =1 ’3'? “7/5
0 2. A freely falling body has an acceleration of 9.8 m/s2 downward. This means that: a. the body falls 9.8 meters during each second
b. the body falls 9.8 meters during the ﬁrst second only
@ the speed of the body increases by 9.8 rn/s durin each second
d. the acceleration of the body increases by 9.8 oils in each second
e. the acceleration of the body decreases by 9.8 m/s2 in each second 3. Two forces are acting on an object as shown. 80 N 120 N What is the magnitude of the resultant force? a. 40N 9?, = 120 625 60"— 30 405%"
b. 47.5N = 3q_ 20”, ® 185N
d_ 193N [9,: ISLE/V e. 200N
—> {2 =m 4. A ball thrown horizontally from a point 24 m above the ground, strikes the ground
after traveling horizontally a distance of 18 m. With what speed was it thrown? a. 2.7m/s Time 0! 1411/ from verhha/ moﬁ'ang
Sim/S o=Z4m+0+%C—qvgn/$2)i? c. 13mfs
d. l9m/s ___ _. 223 s
e. 23m/s ﬁ> é Ham barfZon'f'al moh'o": y: lam ngm/s
° 22133 6. A chair of mass 5.00 kg, sitting on a rough horizontal surface, requires a force of
32.0 N applied in a horizontal direction to cause it to slide at constant speed. If a
person of mass 65.0 kg sits in the chair; what horizontal force is now required to
slide the person and chair at constant speed? APP/[dd 760”: f5 Equal to LII/75 (0’6: 0'; a. 32.0N _
b. 49.0N kinetic Inté'on fr) both sifmﬁons. so,
223% 32”: 120‘: Csaa/<a)C0So ms“) ‘3 536N F = We (70.00k3) (Guam/51) You are standing on a weight scale in an elevator. 0f the following, the scale
shows the highest reading when the elevator: moves upward with constant speed
moves upward with decreasing speed
moves downward with increasing speed
moves downward with constant speed
moves downward with decreasing speed 099 9‘s» Two moons orbit a planet in nearly circular orbits.
Moon A has orbital radius r, and moon B has
orbital radius 4r. Moon A takes 20 days to
complete one orbit. How long does it take moon B
to complete an orbit? /5'_"’7
U I" V
Sdays A __i._—/::.2
7’ a. : 4
b. 20days 93' 6M A
80days T 160days
e. 320days IQ:(2'3‘rB/Vé) :(fg)(ﬁ):4x2=$
'7; am a, la) ’2: 9/4 A car goes around a ﬂat curve of radius 50 m at a speed of 14 m/s without
slipping. Which of the following statements, regarding friction between the tires and the road, is correct? M v1
@ coefficient of static friction is 0.40 or greater Mg m 00 >/ ——— b. coefﬁcient of static friction is 0.40 or smaller (3 c. coefﬁcient of kinetic ﬁction is 0.40 or greater 2 d. coefficient of kinetic friction is 0.40 or smaller 3> (/15 > 1— e. The road is frictionless / [Q g Part II: Problems (60 marks) This part consists of 4 problems that require detailed solutions. Show all your work,
including neat and clearly labelled diagrams. Each problem is worth 15 marks. Partial
credit will given for partially correct solution steps. 9. The engineer of a passenger train traveling at 25.0 m/s sights a freight train whose
caboose is 200 m ahead on the same track The freight train is traveling at 15.0
mfs in the same direction as the passenger train. The engineer of the passenger
train immediately applies the brakes, causing a constant deceleration of 0.200
Iii/52, while the freight train continues with constant speed. (3.) Where will the two trains collide? (b) What is the speed of the passenger train just before the collision? a) ﬁst/rm: £17547} *he Cal/1's/bn
af [I happpns 1 paslib'ob train. . 75m We W I
o + (25~omls) t + q— _ z t1
2 (—02.0070/5 3 x :2 200m + CI5.om/S) t + 0 4t '83 30/014915"? 71/15 744/0 aqua/92205 abmre, W5 05+ o.ié2_ 107i +200=° /___———————
g If )0: Clb)°‘_4(ol)(2c=a)
9 r. 2Xol We select £106 Snow/Icy ﬁl’mc, t : 27. 6 9 b
) UP; =<Z5m/$)‘1"C—O200m/53 = )(2769) '5 "Vs 10. A plane ﬂying hoﬁzontally, at a speed of 50.0 m/s and at an elevation of 160 m,
drops a package. Two seconds later it drops a second package.
(a) How far apart will the two packages land on the ground?
(b) What is the velocity of each package when it hits the ground? <—7‘—"* 0L) since the if;
harl'chnr‘a! \ \ \\\
v'e/ocl'lg of éhc A \\ \33‘
Package is cons¥anf \\ \\
and equal J)»: \ \ P/ane's Speed, A “wen we mica, <——7t* x = (50.0 m/5)(2.oo s) = [/00 m} b) 7170”: vac Verfr'c'a/ moﬁt'on, we have,
@623 o +2C‘q80W/S’)(o—I60M)
—‘> 7/; =—560 m/s 9": 306/? Package 11,45 Hat: ground wfIh
a. speed 50
= W  75l MIS 56
ml an angle & 1 l. A block of mass 1.3 kg is projected upwards along an inclined plane with an
initial speed of 5.0 MS. The angle of inclination of the inclined plane to the
horizontal is 25°. The coefﬁcients of
static and dynamic friction between
the block and the inclined plane are
0.58 and 0.52, respectively. (3.) Calculate the deceleration of the 5.0 m/s block while moving up the plane.
(b) When the block stops at its
maximum height, is it going to slide
down again? Explaine. a) ,. 7716. Ad farce ﬂeeing
On #he block is dint, £60] down the incline and
has a magm'lu/e. F: mg sing? + [ALA mg 6055’
*So, the date/cradion /'5 equal £0 F
az—yﬁ" =‘ QCSI'nQ—fMt 605(9)
2? w W/ygn the. bIDC/k Sic/>5 a1! #5 m’x;m"m hct'ght/ eke force of grayfib gagn3 on ,4 down the incline
1's e ml :50: 3
7 ’2
While £103 mahmum fang o/ SMHC. (’H'C‘Hon 1's
1;, = MAS mg C959 .2 6.?0A/ ’30, Has block will slide down again. mgsi‘np : 5.38A/ 12. You are a civil engineer designing a road that has a speed limit of 100 km/h. There is curve on road with a radius of 150 m.
(a) What should be the minimum value of the coefﬁcient of static friction between the times and the road that allows cars to turn safely at the speed limit? (b) What is the proper banking angle so that cars, moving at the speed limit, can
turn the curve safely even in extreme weather conditions where the road is
practically frictionless? a) 5,, a. [747‘ (Wham/(col) CWWI we hat/a my}
Ms m?) = T
2 ' )2
ewes: v .. cum/s Rs ' Cléom)(q.go~/$3)
_\‘.:'> 1W5 : b) 5r a banked furHanks; Cugw, we have mvz 13 Sing '5 “'73— ); 6059 ‘' mﬂ ...
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This note was uploaded on 05/06/2011 for the course PHYS 103N taught by Professor Chiu during the Spring '11 term at University of Texas.
 Spring '11
 Chiu
 Physics

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