Answers25-26 TX-Physics A-CRUnit Test

Unit Test — Cumulative exam Answers

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1
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Which will most likely lead to new scientific discoveries in future years?

A
current scientific knowledge
B
current science fiction movies
C
reduction of the elementary school science curriculum
D
rejection of all new scientific ideas
2
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Earth and all of the air in the atmosphere around it make up an incredibly complex system. Energy is constantly changing forms in many different ways.

A
Earth is an isolated closed system because energy only escapes the system as heat travels into space.
B
Earth is an isolated closed system because the atmosphere allows energy from the Sun to enter as heat.
C
Earth is an open system because the atmosphere stops energy from escaping into space.
D
Earth is an open system because heat energy from the Sun enters through the atmosphere.
3

The MSDS for glacial acetic acid says that it is a flammable liquid that can severely burn any human tissue it comes in contact with. It reacts with bases, various metals, and strong oxidizing agents. Its vapors can form explosive mixtures with air. Based on this information, which statement is applicable to glacial acetic acid?

A
It should be heated to remove moisture and stored on a lab shelf.
B
It should be handled on a clean, dry area of the lab bench.
C
It should be stored in an iron container, away from open flames.
D
It should be handled in a fume hood, away from open flames.
4

Which area of concern for environmental lawyers has grown rapidly in the past 20 years?

A
the replacement and disposal of electronic devices
B
the genetic engineering of biological heart pacemakers
C
the development and distribution of cancer-fighting drugs
D
the advances in vaccinations to prevent once-deadly diseases, such as polio
5

An object is represented by the dot on the motion map.

Question illustration
A
a car driving over the top of a hill
B
a ball on a string that stopped at the top of a vertical loop
C
a roller coaster car at the top of a vertical loop of track
D
a bug on the top of a rolling hula hoop
6

The diagram shows two balls released from a device at the same time. The ball on the left falls freely from rest, and the ball on the right is launched horizontally.

Question illustration
A
Both balls have constant velocity and are acted on by gravity.
B
Both balls are acted on by gravity and are accelerating downward.
C
Both balls are pulled downward and have zero acceleration.
D
Both balls have zero acceleration and have constant velocity.
7

Motion maps for two objects, Y and Z, are shown.At which time does Object Y pass Object Z?

Question illustration
A
2
B
3
C
4
D
5
8

Leo drew a force diagram to represent a satellite in orbit around Earth.

Question illustration
A
make the Fg vector longer
B
change the vector labeled Fair so it is labeled Fp
C
add an Fp vector at the center and pointing left
D
remove the Fair vector
9

Using this chart, which career professional has the highest projected growth rate and the highest median pay?CareerDegree required% projected growth rate (2010–2020)2010 median payBiomedical engineerBachelor’s29+$75,000+Natural science managerBachelor’s0-9$75,000+SonographerAssociate’s29+$55,000-$74,999Environmental science technicianAssociate’s20-28$35,000-$54,999

A
biomedical engineer
B
environmental science technician
C
natural science technician
D
sonographer
10

Which best illustrates projectile motion?

A
A pictorial diagram showing a hot air balloon in four different positions, each the same height from the ground and equally spaced.
Option A
B
A pictorial diagram with a rocket launched straight upward. The first three positions of the rocket are shown with equal spacing between them.
Option B
C
A pictorial diagram with a person swimming and position shown in equal time intervals and equally spaced.
Option C
D
A pictorial diagram of a person hopping sideways at 5 different positions. The start and end positions are on the ground. The third image is the highest off the ground.
Option D
11

Which trait would most likely lead a scientist to investigate a blood-thinning agent in the saliva of vampire bats?

A
creativity
B
curiosity
C
diversity
D
skepticism
12

The diagram shows a position-time graph.

Question illustration
A
–2 m
B
–1 m
C
3 m
D
4 m
13

Quarks are thought to be the building blocks of protons. Which was most affected by the discovery of the quark?

A
the estimated mass of a proton
B
the observation that protons have a +1 charge
C
the view that the atom cannot be broken down further than protons
D
the theory that the nucleus of an atom contains protons and neutrons
15

Four different balls are moving at the same velocity. Which will have the greatest kinetic energy as it rolls?

A
a golf ball
B
a bowling ball
C
a tennis ball
D
a soccer ball
16

In the equation for centripetal force, which expression represents the centripetal acceleration of the object?

A
mv2
B
StartFraction m over r EndFraction
Option B
C
StartFraction v Superscript 2 Baseline over r EndFraction
Option C
D
StartFraction m times v Superscript 2 Baseline over r EndFraction
Option D
17

The free-body diagram of a crate is shown.

Question illustration
A
352 N to the left
B
176 N to the left
C
528 N to the right
D
440 N to the right
19

Two objects are interacting, but stay stationary. Which best describes what is happening to the action and reaction forces?

A
There are no forces acting on the objects.
B
The forces are equal and opposite each other.
C
One object is exerting more force than the other.
D
Their forces are occurring at different times.
20

What career grew as a result of the invention of ultrasound imaging devices?

A
geneticist
B
conservationist
C
epidemiologist
D
sonographer
21

Which graph shows an object with constant acceleration?

A
Option
Option A
B
A graph titled Velocity versus Time shows time in seconds on the x axis, numbered 0 to 10, and velocity in meters per second on the y axis, numbered 0 to 50. A line starts at the origin and goes to (4, 40), then a line from (4, 40) to (9, 40) and a line from (9, 40) to (10, 0).
Option B
C
A graph titled Velocity versus Time shows time in seconds on the x axis, numbered 0 to 5, and velocity in meters per second on the y axis, numbered 0 to 10. A line starts at (0, 10) and ends at (5, 0).
Option C
D
A graph titled Velocity versus Time shows time in seconds on the x axis, numbered 0 to 5, velocity in meters per second on the y axis, numbered 0 to 35. A curved line starts at the origin and arcs up to (4.3, 35).
Option D
22

A car drives 16 miles south and then 12 miles west. What is the magnitude of the car’s displacement?

A
4 miles
B
16 miles
C
20 miles
D
28 miles

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