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Unformatted text preview: October 4, 2001 PAGE 1_ EXAM VERSION AEDBC Physics 103 Fall 2001 Exam 1 BEFORE BEGINNING THE EXAM Write and fill in your name, your 10—digit student ID number, and your section
number (301 to 329) in the special codes boxes A, B, and. C on the answer
sheet. Each exam has a fiveletter code, such as ABCDE. Carefully enter this five—
letter code as the first five "answers" on the anSWer sheet. For example, for
exam ABCDE, number one on the answer sheet should be marked "A", number two
"B", number three "C", and so on. Thus THE EXAM BEGINS WITH QUESTION NUMBER
6! Answer ALL 20 questions. Guessing is NOT penalized! Don't spend too much time on any particular problem, but move on and come back
to it later. YOU MUST HAND IN THE EXAM TO YOUR DISCUSSION SECTION TA YOU MAY ONLY USE PENCILS, A CALCULATOR, AND YOUR FORMULA SHEET FOR THE EXAM MULTIPLE CHOICE Note the expression: y = X2. which statement is most consistent with this
expression? a if y doubles, then X quadruples
b y is greater than X c. if X doubles, then y doubles d if X doubles, then y quadruples
e. X is greater than y In mechanics, physicists use three basic quantities to derive additional
quantities. Mass is one of the three quantities. What are the other two? power and force
velocity and time
length and time
force and time
length and force (DODUN A furlong is a distance of 220 yards. A fortnight is a time period of 2 weeks.
A race horse is running at a speed of 5 yards per second. What is his speed in
furlongs per fortnight? 13,674 furlongs/fortnight
1,324 furlongs/fortnight
6,221 furlongs/fortnight
2,749 furlongs/fortnight
27,491 furlongs/fortnight (DDDUN 10. 11. 12. 13. October 4, 2001 PAGE 2 EDLALJVEﬁUﬂCMQ!JﬂDBC The speed of a boat is often given in knots. If a speed of 5 knots were
expressed in the SI system of units, the units would be: a. m
b. s c m/s
d kg/s
e m/sz a. x u —1.0 b. x  0.5 c. x  1.0 d. x  1.5 e. x  0.5 A bird, accelerating from rest at a constant rate, experiences a displacement
of 28 m in 11 3. What is the final velocity after 11 s?
a. 3.2 m/s b. 4.0 m/s c. 5.1 m/s d. zero e. 1.8 m]: A bird, accelerating from rest at a constant rate, experiences a displacement of 28 m in 11 3. What is its acceleration? m/s2
m/32
m/s2
m/s2
m/s2 a. 0.46
b. 0.84
c. 0.64
d. 0.78
e. 0.21 A European sports car dealer claims that his product will accelerate at a
constant rate from rest to a speed of 100 km/hr in 8 5. What is the speed
after the first 5 s of acceleration? a. 44.4 m/s
b. 53.2 m/s
c. 28.7 m/s
d. 17.4 m/s
e. 34.7 m/s l4. 15. l6. 17. 18. October 4, 2001 PAGE 3 EXAM VERSION AEDBC Human reaction time is usually about 0.2 5. If your lab partner holds a ruler
between your finger and thumb and releases it without warning, how far can you
expect the ruler to fall before you catch it? At least: a 9.8 cm b. 7.2 cm c. 16.0 cm d 19.6 cm e. 4.0 cm At the top of a cliff 100 m high, Raoul throws a rock upward with velocity 15
m/s. How much later should he drop a second rock from rest so both rocks arrive simultaneously at the bottom of the cliff? a 3.76 s
b 0.89 s
c 2.67 s
d 1.78 s
e 5.05 s Arvin the Ant is on a picnic table. He travels 30 cm eastward, then 25 cm
northward and finally 15 cm westward. What is the magnitude of Arvin's net displacement? a. 57 cm b. 42 cm c. 52 cm d. 29 cm e. 70 cm Arvin the Ant travels 30 cm eastward, then 25 Cm northward and finally 15 cm
westward. What is Arvin's directional displacement with respect to his
original position? a. 29° N of E b. 59° N of W C. 29° N of W d. 77° N of E e. 59° N of E Vector A is 3 units in length and points along the positive x—axis; vector B is 4 units in length and points along a direction 150° from the positive x axis. What is the direction of the resultant with respect to the positive x
axis? a. 13° b. 43° c. 86° d. 103° e. 77° 19. 20. 21. 22. October 4, 2001 PAGE 4 EXAM VERSION AEDBC A ball is rolled off a table with an initial speed of 0.24 m/s. A stop watch
measures the ball's trajectory time from table to the floor to be 0.3 5. What
is the height of the table? (g = 9.8 m/s2 and air resistance is negligible) a. 0.22 m
b. 0.55 m
c. 0.33 m
d. 0.44 m
e. 0.11 m A ball is rolled off a table with an initial speed of 0.24 m/s. A stop watch
measures the ball's trajectory time from table to the floor to be 0.3 5. How
far away from the table does the ball land? (9 = 9.8 m/s2 and air resistance is negligible) .072'm
.144 m (DO06m
o H H o o
N
S An airplane of mass 1.2 x 104 kg tows a glider of mass 0.6 x 104 kg. The
airplane propellers provide a net forward thrust of 3.6 x 104 N. What is the glider's acceleration? a. 3.0 m/s2
b. 4.0 m/s2
c. 6.0 m/s2
d. 9.8 m/s2
e. 2.0 m/s2 Two blocks of masses 20 kg and 8 kg are connected together by a light string
and rest on a frictionless level surface. Attached to the 8 kg mass is another
light string which a person uses to pull both blocks horizontally. If the two
block system accelerates at 0.5 m/sz, then what is the tension in the connecting string between the blocks? a 6 N
b. 5 N
c. 10 N
d 4.0 N
e. 14 N 23. 24. 25. October 4, 2001 PAGE 5 EXAM VERSION AEDBC A 250 kg crate is placed on an adjustable inclined plane. If the crate slides
down the incline with an acceleration of 0.7 m/s2 when the incline angle is
25°, then what should the incline angle be for the crate to slide down the
plane at constant speed? (g'= 9.8 m/sz) 21°
18°
25°
29°
12° (DQOU'W A man pulls a sled at a constant velocity across a horizontal snow surface. If
a force of 80 N is being applied to the sled rope at an angle of 53° to the
ground, what is the force of friction between sled and snow? a. 64 N
b. 56 N
c. 48 N
d. 40 N
e. 80 N A trapeze artist, with swing, weighs 800 N; he is being held to one side by
his partner so that the swing ropes make an angle of 30° with the vertical. In
such a condition of static equilibrium what is the tension in the rope? a. 400 N
b. 800 N
c. 196 N
d. 461 N
e. 924 N ...
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This note was uploaded on 10/05/2009 for the course PHYS 2010 taught by Professor Dubson during the Fall '06 term at Colorado.
 Fall '06
 DUBSON
 Physics

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