# Physics Midterm

B
Which of the following is an area of physics that studies motion and its causes?
a. Thermodynamics
b. Mechanics
c. Quantum mechanics
d. Optics
C
a. Optics
b. Thermodynamics
c. Vibration and wave phenomena
d. Relativity
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B
A baker makes a loaf of bread. Identify the area of physics that this involves.
a. Optics
b. Thermodynamics
c. Mechanics
d. Relativity
C
A hiker uses a compass to navigate through the woods. Identify the area of physics that this involves.
a. Thermodynamics
b. Relativity
c. Electromagnetism
d. Quantum mechanics
C
The SI base unit used to measure mass is the
a. Meter
b. Second
c. Kilogram
d. Liter
D
The SI unit for time is
a. 1 day
b. 1 hour
c. 1 minute
d. 1 second
C
The most appropriate SI unit for measuring the length of an automobile is
a. Micron
b. Kilometer
c. Meter
d. Nanometer
A
In scientific notation, 674.3 mm equals
a. 6.743 x 10^2 mm
b. 6.743 x 10^3 km
c. 6.743 x 10^2 m
d. 6.743 x 10^2 mm
D
In scientific notation, 0.000005823 ug equals
a. 5.823 x 10^6 ug
b. 5.823 x 10^-9 ug
c. 5.823 x 10^-12ug
d. 5.823 x 10^-6ug
A
Calculate the following and express the answer in scientific notation with the correct number of significant figures: 10.5 x 8.8 x 3.14
a. 2.9 x 10^2
b. 290.136
c. 2.90 x 10^2
d. 290
A
The Greek letter Δ indicates
a. Difference or change
b. Sum or total
c. Direct proportion
d. Inverse proportion
A
A lack of precision in scientific measurements typically arises from
a. Limitations of the measuring instrument
b. Human error
c. Lack of calibration
d. Too many significant figures
A
How many significant figures does 50.00300 have
a. Seven
b. Two
c. Five
d. Three
A
Which of the following is the equation for average velocity?
a. Vavg= Δx/ Δt
b. Vavg= Δt/ Δx
c. Vavg= Δx*Δt
d. Vavg= (Vi – Vf)/2
D
Which of the following situations represents a negative displacement?(assume positive position is measured vertically upward along a y-axis)
a. A cat stands on a tree limb
b. A cat jumps from the ground onto a tree limb
c. A cat jumps from a lower tree limb to the ground
d. A cat jumps from a tree limb to the ground
C
Which of the following units is the SI unit of velocity?
a. Meter
b. Merter*Second
c. Meter per second
d. Second per meter
B
According to the graph above, during which interval is the cat at rest?(refer to chapter 2 quiz 1)
a. 0.0-5.0 s
b. 5.0-10.0s
c. 10.0-15.0s
d. 15.0-20.0s
A
According to the graph above, during which interval does the cat have the greatest positive velocity?(refer to chapter 2 quiz 1)
a. 0.0-5.0 s
b. 5.0-10.0s
c. 10.0-15.0s
d. 15.0-20.0s
D
According to the graph above, the cat has the fastest speed during which interval?(refer to chapter 2 quiz 1)
a. 0.0-5.0 s
b. 5.0-10.0s
c. 10.0-15.0s
d. 15.0-20.0s
C
In the graph above, what is the correct description of any location to the left of the zero?(refer to chapter 2 quiz 1)
a. Negative displacement
b. Negative distance
c. Negative position
d. Negative change of displacement
B
In the graph above, a toy car rolls from +3m to +5m. Which of the following statements is true?(refer to chapter 2 quiz 1)
a. Xf= +3 m
b. Xi= +3 m
c. Δx= +3 m
d. Vavg= 3m/s
D
Acceleration is defined as
a. A rate of displacement
b. The rate of change of displacement
c. Change in velocity
d. The rate of change of velocity
B
Which of the following is the equation for acceleration?
a. Vavg= Δx/ Δt
b. Vavg= Δv/ Δx
c. Vavg= Δx*Δt
d. Vavg= (Vi – Vf)/2
C
What is the SI uni of acceleration?
a. m/s
b. m^2/ s
c. m/s^2
d. m*s^2
A
When a car’s velocity is positive and its acceleration is negative, what is happening to the car’s motion?
a. The car slows down
b. The car speeds up
c. The car travels at constant speed
d. The car remains at rest
B
When a car’s velocity is negative and its acceleration is negative, what is happening to the car’s motion?
a. The car slows down
b. The car speeds up
c. The car travels at constant speed
d. The car remains at rest
C
In the graph above, how does the acceleration at A compare with the acceleration at B?(refer to chapter 2 quiz 2)
a. The acceleration at A is positive and less than the acceleration B.
b. The acceleration at B is positive and less than the acceleration A.
c. The acceleration at A and B are each zero.
d. The acceleration at A and B cannot be determined
0.0m/s
What is the speed of an object at rest?
C
Which of the following is a physical quantity that has a magnitude but no direction?
a. Resultant
b. Vector
c. Scalar
d. Frame of reference
D
Which of the following is a physical quantity that has both magnitude and direction?
a. Scalar
b. Frame of reference
c. Resultant
d. Vector
C
Which of the following is an example of a vector quantity?
a. Temperature
b. Mass
c. Velocity
d. Volume
D
Identify he following quantities as scalar or vector: the mass of an object, the number of leaves on a tree, wind velocity.
a. Scalar, vector, scalar
b. Vector, scalar, vector
c. Vector, scalar, scalar
d. Scalar, scalar, vector
A
Identify the following quantities as scalar or vector: the speed of a snail, the time it takes to run a mile, the free-fall acceleration.
a. Scalar, scalar, vector
b. Vector, scalar, vector
c. Scalar, vector, vector
d. Vector, scalar, scalar
B
Multiplying or dividing vectors by scalar a results in
a. Scalars
b. Vectors
c. Vectors if multiplied or scalar if divided
d. Scalars if multiplied or vectors if divided
D
An ant on a picnic table travels 3.0 x 10^1 cm eastward, then 25 cm northward, and finally 15 cm westward. What is the magnitude of the ant’s displacement relative to its original position?
a. 70 cm
b.57 cm
c. 52 cm
D. 29 cm
C
For the winter, a duck flies 10.0 m/s due south against a gust of wind with a speed of 2.5 m/s. What is the resultant velocity of the duck?
a. 12.5 m/s south
b. -12.5 m/s south
c. 7.5 m/s south
d. -7.5 m/s south
A
In a coordinate system, a vector is oriented at angle 0 with respect to the x-axis. The x component of the vector equals the vector’s magnitude multiplied by which trigonometric function?
a. Cos θ
b. Cot θ
c. Sin θ
d. Tan θ
C
In a coordinate system, a vector is oriented at angle 0 with respect to the x-axis. The y component of the vector equals the vector’s magnitude multiplied by which trigonometric function?
a. Cos θ
b. Cot θ
c. Sin θ
d. Tan θ
C
How many displacement vectors shown in the figure above have horizontal components?(view Chapter 3 Quiz 2)
a. 2
b. 3
c. 4
d. 5
B
How many displacement vectors shown in the figure above have components that lie along the y-axis and are pointed in the -y direction? (Refer to chapter 3 quiz 2)
a. 0
b. 2
c. 3
d. 5
D
Find the resultant of these two vectors: 2.00 x 10^2 units due east and 4.00 x 10^2 units 30.0 degrees north of west.
a. 300 units, 29.8* north of west
b. 581 units, 20.1* north of east
c. 546 units, 59.3* north of west
d. 248 units, 53.9* north west
C
Which of the following is the motion of objects moving in two dimensions under the influence of gravity?
a. Horizontal velocity
b. Directrix
c. Projectile motion
d. Vertical velocity
C
Which of the following is an example of projectile motion?
a. An aluminum can dropped straight down into the recycling bin
b. A space shuttle being launched
c. A thrown baseball
d. A jet lifting off a runway
C
Which of the following is not an example of projectile motion?
a. A volleyball served over a net
b. A long jumper in action
c. A hot-air ballon drift
d. A baseball hit by a bat
B
What is the path of a projectile(in the absence of friction)?
a. A wavy line
b. A parabola
c. Projectile do not follow a predictable path
d. Hyperbola
B
Which of the following exhibits parabolic motion?
a. Space shuttle orbiting Earth
b. A stone thrown into a lake
c. A train moving a long a flat track
d. A leaf falling from a tree
B
Which of the following does not exhibit parabolic motion?
a. A baseball thrown to home plate
b. A flat piece of paper released from a window
c. A frog jumping from land into water
d. A basketball thrown to a hop

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