Name: ________________________ Class: ___________________ Date: __________
ID: A
Exam 1-- PHYS 101
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____
____
____
1. The SI units for mass, length, and time are, respectively:
a. gram, meter, and second
c. kilogram, centimeter, and second
b. slug, inch, and second
d. kilogram, meter, and second
2. Ten cubic meters (10 m 3) is equal to how many cubic centimeters (cm 3)
c. 1×105
a. 1×103
6
b. 1×10
d. None of the above
3. These variables have the following units:
m : kilograms
v : meters/second
g: meters/second2
a: meters/second 2
h: meters
x: meters
t: seconds
____
____
____
Using dimensional analysis, determine which of these equations is not valid:
c. x=½vt2
a. ½mv2=mgh
b. x=vt
d. v=at
4. You measure the length of a piece of wood. You determine its length is 1.2 meters, but the uncertainty in the
measurement is 0.2 meters. Which of these is a valid value, given your uncertainty, for the length of this
object?
a. 0.9 m
c. 1.1 m
b. 2.4 m
d. 1.5 m
5. Assume that Goaux Hall is 50 times the size of this classroom. Estimate the volume of Gouaux Hall in cubic
meters:
c. 25,000,000 m3
a. 25,000 m3
3
b. 0.25 m
d. 25 m3
6.
How many significant figures are in this number: 0.004670
a.
b.
6
4
c.
d.
1
7
3
Name: ________________________
____
7. In this figure, the coordinates are given for the point; these coordinates are in the Cartesian coordinate
system. If you wanted to express the polar coordinates (r,θ), what would those values be?
a.
b.
____
ID: A
(r=6.00, θ=216°)
(r=4.30, θ=36°)
c.
d.
(r=4.30, θ=216°)
(r=4.30, θ=180°)
8.
This graph represents the velocity of an object over a time of five seconds. What is its average acceleration
between points B and C?
a.
b.
1.5 m/s2
1 m/s2
c.
d.
2
0 m/s2
0.5 m/s2
Name: ________________________
____
ID: A
9.
This graph represents the position of a particle over a time of five seconds. What is the particle’s
instantaneous velocity at t=2 seconds?
____ 10.
____ 11.
____ 12.
____ 13.
____ 14.
____ 15.
a. -4 m/s
c. 0 m/s
b. 2 m/s
d. 0.5 m/s
A guy walks 10 meters towards the North. Then, he walks 5 meters to the east. What is the angle of his
displacement?
c. 79° S of Ε
a. 27° Ν of Ε
b. 63° Ν of Ε
d. 84° Ε of N
You are in a car traveling 30 m/s towards the East, which we will assume is the positive direction. You
observe a car, across the median, driving 40 m/s towards the West. What is the relative velocity of the car
that you observe with respect to your car (i.e. what is your perceived velocity of the car)?
a. 10 m/s
c. 70 m/s
b. -10 m/s
d. -70 m/s
You see a car accelerating at 10 m/s 2. Express this acceleration in miles/hour 2. (1 mile=1609 meters)
c. 0.006 mi/hr2
a. 80,000 mi/hr2
2
b. 20 mi/hr
d. 1×108 mi/hr2
A brick is thrown from the top of a building at an angle of 30° to the horizontal and with an initial speed of
10 m/s. If the brick is in flight for 5.0 s, how tall is the building?
a. 73 m
c. 98 m
b. 150 m
d. 50 m
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Given that A + B = C and | A | + | B | = | C | , how are vectors A and B oriented with respect to one
| | | | | |
another?
a. perpendicular to one another
c. parallel to one another and in opposite
directions
b. parallel to one another and in the same
d. Not enough information given to answer.
direction
While exploring a cave a spelunker starts at the entrance and moves the following distances: 50.0 m west,
25.0 m at an angle 60.0° east of north, and 100. m north. What is the magnitude of his resultant
displacement?
a. 116 m
c. 127 m
b. 175 m
d. 125 m
3
Name: ________________________
ID: A
____ 16. A runner completes one lap around a 400 m track in 70 s. What is his average speed?
a. 2 m/s
c. 6 m/s
b. 330 m/s
d. 0 m/s
____ 17. A truck, initially traveling at 3.0 m/s, slows down at 0.5 m/s 2. It requires a time of 7.0 seconds to come to a
complete stop. What distance did it cover in this time?
a. 21 m
c. 8.8 m
b. 33 m
d. 3.5 m
____ 18. A small mailbag is dropped from a helicopter that is descending steadily at 1.20 m/s. After 3.00 seconds,
how far is the mailbag below the helicopter?
a. 47.7 m
c. 3.60 m
b. 44.1 m
d. 40.5 m
____ 19. A high velocity sling shot can launch a steel ball 320 meters in about 11 seconds. What is the initial velocity
of the steel ball? Assume the initial velocity is only in the horizontal direction.
a. 590 m/s
c. 29 m/s
b. 33 m/s
d. 110 m/s
____ 20. You are adding vectors of length 10 and 25 meters. Which of these is the only resultant magnitude from the
sum of these 2 vectors?
a. 52 m
c. 250 m
b. 7 m
d. 27 m
____ 21. A car is driving at 10 m/s. It then accelerates at 5.2 m/s 2. During this acceleration, the car drives a distance
of 320 m. What time does the car require to complete this distance?
a. 9.3 s
c. 32 s
b. 13 s
d. 1.9 s
____ 22. You drop a very bouncy ball. It falls, and then it hits the floor and bounces right back up to you. Which of
the following represents the velocity versus time graph for the ball’s motion?
a.
c.
b.
d.
____ 23. If each component of a vector is tripled, what happens to the angle of that vector?
a. it doubles
c. it triples
b. it does not change
d. it is decreased by one-third
4
Name: ________________________
ID: A
____ 24. If the x- and y-components of a vector are equal, what is the angle of the vector?
c. 45°
a. 30°
b. 60°
d. 90°
____ 25. Which of these plots represent a moving object with constant acceleration?
a. a & e
e. e
b. d
f. a
c. b
g. c
d. e & f
h. d & b
____ 26. You throw a ball upward with a speed of 10 m/s. Assuming there is no air resistance, what is the speed of the
ball when it returns to you?
a. 0 m/s
c. 98 m/s
b. 10 m/s
d. Not enough information given
5
Name: ________________________
ID: A
____ 27.
Which of these statements represent the motion represented in this plot?
____
____
____
____
a. increasing, positive velocity
c. decreasing, positive velocity
b. increasing, negative velocity
d. decreasing, negative velocity
28. A small cart is rolling at a constant velocity. With negligible air resistance, what happens if a stone is thrown
straight into the air?
a. The stone falls back into the cart.
c. The stone falls in front of the cart.
b. The stone falls behind the cart.
d. Not enough information given to answer
the question.
29. Which of these is a vector quantity?
a. time
c. velocity
b. mass
d. speed
30. From the same height and at the same time, one ball is dropped and another ball is fired horizontally. Which
one will hit the ground first?
a. the dropped ball
c. both
b. the fired ball
d. it depends on the velocity of the fired
ball
31. What should be the launch angle (from the horizontal) to achieve the maximum range of a projectile?
c. 60°
a. 30°
b. 45°
d. 90°
6
ID: A
Exam 1-- PHYS 101
Answer Section
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