ame: ________________________ Class: ___________________ Date: __________
ID: A
Exam 1--PHYS 101--Fall 2009
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____
1. In square centimeters (cm2), what is the area of this paper?
____
c. 60 cm2
a. 60,000 cm2
2
b. 600 cm
d. 6000 cm2
2. The standard unit of measure for the SI unit of time is based on which of these:
a.
____
the time required for light to travel 1
c. characteristic frequency of the
meter
cesium-133 atom
b. average solar day
d. a fraction of the sidereal day
3. Which of these equations is dimensionally correct? (x: meters, v: meters/second, a: meters/second 2, and m:
kilograms)
I.
1 2
mv = xma − π mx
2
II. v 2 = v 20 + 2ax
III. x − v 0 t =
____
1
2
at 2
a. I
d. II & III
b. II
e. I & III
c. III
4. Complete this arithmetic operation, keeping proper significant figures:
2.01 + 3.0 + 20.10 + 300.42
a.
b.
c.
325.53
325.5
326
d.
e.
1
330
300
ame: ________________________
____
____
ID: A
5. This figure shows the position versus time for a particle. What is the particle’s average velocity from t=2 to
7 seconds?
a. 3.5 m/s
c. 3 m/s
b. -5 m/s
d. -3 m/s
6. A plane lands on an aircraft carrier with a speed of 70 m/s. The plane’s tailhook snags a cable, which slows
the plane to rest in 2.0 seconds. Assume the plane undergoes constant acceleration; how far does it travel in
this time?
a.
b.
70 m
140 m
c.
d.
2
210 m
35 m
ame: ________________________
____
____
ID: A
7. A car accelerates at a rate of 2.0 m/s 2. What is this expressed in units of miles/hour 2? (1 mile = 1609 meters)
a. 0.89 mi/hr2
c. 4.5 mi/hr2
-4
2
b. 2.5x10 mi/hr
d. 16,000 mi/hr2
8. You throw a ball towards the ground, it bounces, and returns to your hand. Which of these plots best
describes the motion of the ball from the moment you release it to the moment you catch it?
a.
c.
b.
d.
3
ame: ________________________
____
ID: A
9. This graph shows the velocity versus time for a particle. What is the particle’s instantaneous acceleration at
t=70 seconds?
a.
b.
-1 m/s2
-0.3 m/s2
c.
d.
12 m/s2
3.5 m/s2
____ 10.
Which of these statements represent the motion represented in this plot?
a.
b.
decreasing, positive velocity
increasing, positive velocity
c.
d.
4
increasing, negative velocity
decreasing, negative velocity
ame: ________________________
ID: A
____ 11. Which of these quantities is a scalar quantity?
I. Mass
II. Speed
III. Time
IV. Distance
a.
b.
c.
II
IV
I & III
d.
e.
II & IV
All of these
____ 12. The following figure shows vectors ä
A and ä
B . What is the result of the sum ä
A +ä
B?
a.
c.
b.
d.
5
ame: ________________________
ID: A
____ 13. A particle begins at the origin (0,0) and travels 3.4 m to the right. Then it moves 2.8 meters at 120° from the
+x-axis. Finally, it moves 1.2 m down. What is the magnitude of the particle’s displacement?
a.
b.
5.0 m
7.4 m
c.
d.
3.2 m
2.3 m
| | ä| | ä|
ä+B
ä=C
ä and | ä
ä
ä
____ 14. If the vectors A
| A | + | B | = | C | . How are the vectors A and B related to one another?
a. they’re pointing in the same direction
c. they are pointing opposite one another
b. they’re second cousins
d. they’re perpendicular to one another
____ 15. This figure shows the trajectories of 3 punts, each of which has the same initial velocity. What is the
relationship between the angles of launch, as measured from the +x axis, for each of the trajectories?
a.
b.
θ A < θB = θC
θC < θB < θ A
c.
d.
6
θ A < θB < θC
θB < θ A < θC
ame: ________________________
ID: A
____ 16. An archer shoots an arrow with an initial speed of 100 m/s at an angle of 30° from the horizontal. How high
does the arrow travel?
a. 380 m
c. 0.2 m
b. 510 m
d. 130 m
____ 17. A brick is thrown upward from the top of a building at an angle of 25° to the horizontal and with an initial
speed of 15 m/s. If the brick is in flight for 3.0 seconds, what is the horizontal displacement of the brick?
a. 41 m
c. 1100 m
b. 45 m
d. 19 m
____ 18. You drop a package from a plane flying at a constant speed. Without air resistance, the package will:
a.
b.
quickly lag behind the plane while falling c.
remain vertically under the plane while
d.
falling
7
move ahead of the plane while falling
not enough information
ame: ________________________
ID: A
____ 19. This figure shows an elevator that is accelerating upward at 10 m/s 2. A 10 kg mass hangs by a rope inside the
elevator. What is the tension in the rope?
a. 0 N
c. 200 N
b. 100 N
d. 150 N
____ 20. This figure shows an inclined plane with a block resting on it. The 3 forces--normal force, weight, and an
ä--are labeled. Which of the following is an appropriate equation that follows from the
applied force F
application of Newton’s second law of motion?
a.
b.
ä=F
ä
F
ä
ä
F − F W = ma
c.
d.
8
ä −F
ä sin θ = ma
F
W
y
ä
ä
F − F sin θ = 0
W
ame: ________________________
ID: A
____ 21. A dockworker loading crates on a ship finds that a 100-kg crate, initially at rest on a horizontal surface,
requires a 400-N horizontal force to set it in motion. However, after the crate is in motion, a horizontal force
of 300 N is required to keep it moving with a constant speed. What is the coefficient of static friction
between crate and floor?
a. 0.3
c. 1.2
b. 0.1
d. 0.4
____ 22. From rest, we step on the gas of our Ferrari, providing a force F for 10 secs, speeding it up to a final speed v.
If the applied force were twice the original force (2F), how long would it have to be applied to reach the same
final speed?
a.
b.
5 seconds
10 seconds
c.
d.
9
2 seconds
20 seconds
ame: ________________________
ID: A
____ 23. A mass sits on the bottom of an elevator that is in freefall with a downward acceleration of 9.8 m/s 2. Which
of these statements about the normal force acting on the block is true?
a. N=mg
c. N>0
b. N<0
d. N=0
____ 24. Antilock breaks keep the car wheels from locking up when you stop your car. Why does this help slow the
car down?
a.
b.
µk > µs so static friction is better
µk > µs so sliding friction is better
c.
d.
µs > µk so static friction is better
µs > µk so sliding friction is better
____ 25. The answer to this question is “C.” Bubble “C” for this question.
a. A
c. C
b. B
d. D
10
ID: A
Exam 1--PHYS 101--Fall 2009
Answer Section
MULTIPLE CHOICE
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