AnswersBHS-Physics A-CR w Prescriptive TestUnit Test

Unit Test — Unit test Answers

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The tip of a fan blade is 0.61 m from the center of the fan. The fan turns at a constant speed and completes 2 rotations every 1.0 s.

A
6.0 m/s2
B
48 m/s2
C
53 m/s2
D
96 m/s2
2
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The image shows Earth’s orbit around the Sun.

Question illustration
A
The speed increases from W to X because a component of the gravitational force acts in the direction opposite to the velocity.
B
The speed increases from W to X because a component of the gravitational force acts in the direction of the velocity.
C
The speed increases from X to W because a component of the gravitational force acts in the direction opposite to the velocity.
D
The speed increases from X to W because a component of the gravitational force acts in the direction of the velocity.
3

Shari uses the data in the table to predict how her weight on Venus would compare with her weight on Earth.Which is the best prediction Shari could make?

Question illustration
A
Her weight is greater on Venus because Venus has less mass.
B
Her weight is lower on Venus because the acceleration due to gravity is lower.
C
Her weight is lower on Earth because it is farther from the Sun.
D
Her weight is greater on Venus because Venus has a smaller diameter.
4

Juan and Kuri are on a carousel. Juan is closer to the center of the carousel than Kuri. Which statement describes their tangential speeds?

A
Juan and Kuri move the same distance in one revolution, but Juan completes the revolution in less time and has a higher speed.
B
Juan and Kuri complete one revolution in the same time, but Juan travels a shorter distance and has a lower speed.
C
Juan moves a shorter distance in less time than Kuri, but their speeds are the same.
D
Juan and Kuri complete one revolution in the same time, so they have the same speed.
5

Dao makes a table to identify the variables used in the equations for centripetal acceleration.

Question illustration
A
X: centripetal accelerationY: period
B
X: tangential speedY: radius
C
X: radiusY: centripetal acceleration
D
X: periodY: tangential speed
6

The cycle of day and night is a result of Earth’s spinning on its axis, which is Earth’s .

Answer not available
7

The gravitational force between two objects is 3600 N. What will be the gravitational force between the objects if the mass of each object is reduced to one-third of its original mass?

A
400 N
B
1200 N
C
10,800 N
D
32,400 N
8

What causes a satellite to move tangentially to a circular path?

A
air resistance
B
friction
C
inertia
D
gravity
9

Why are satellites placed into orbit at least 150 km above Earth’s surface?

A
to avoid air resistance
B
to match Earth’s curvature
C
to create inertia
D
to increase friction
10

The track of a roller coaster is shown below.

Question illustration
A
W
B
X
C
Y
D
Z
11

Dewayne reviews Kepler’s laws by making the table shown. Which label belongs in each cell of the table?

Question illustration
A
W: FirstX: SecondY: Third
B
W: ThirdX: SecondY: First
C
W: ThirdX: FirstY: Second
D
W: SecondX: ThirdY: First
12

Which expression can be used to calculate centripetal acceleration?

A
StartFraction 2 pi r over T EndFraction
Option A
B
StartFraction 4 pi squared r over r squared EndFraction
Option B
C
StartFraction 4 pi squared r over T EndFraction
Option C
D
StartFraction left parenthesis 2 pi r right parenthesis squared over r squared EndFraction
Option D
13

Sid created a chart to summarize characteristics of satellite motion. Which best describes Sid’s error?

Question illustration
A
Tangential speed changes throughout a satellite’s orbit.
B
Centripetal force is perpendicular to the velocity of the satellite.
C
Tangential speed increases with a satellite’s increasing distance from Earth.
D
Centripetal force can sometimes slow down a satellite in orbit.
14

The table shows information about two of the major moons of Uranus.MoonOrbital Period (days)Average Distance from Uranus (km)Miranda0.319129,390Titania 8.71435,910What is the average distance between Miranda and Uranus?

A
2.84 × 104 km
B
1.29 × 105 km
C
1.47 × 106 km
D
4.65 × 107 km
15

decreasesincreasescontinuously fluctuatesstays constant

A
decreases
B
increases
C
continuously fluctuates
D
stays constant
16

Which statements describe the relationship of Earth and its moon? Check all that apply.The moon orbits Earth following a nearly circular path.The gravitational pull of Earth on the moon is parallel to the velocity of the moon.The moon orbits Earth in 1 Earth day.The same face of the moon always points toward Earth.The moon’s orbit is the result of the interaction between the moon’s inertia and the gravitational force from Earth.

A
The moon orbits Earth following a nearly circular path.
B
The gravitational pull of Earth on the moon is parallel to the velocity of the moon.
C
The moon orbits Earth in 1 Earth day.
D
The same face of the moon always points toward Earth.
E
The moon’s orbit is the result of the interaction between the moon’s inertia and the gravitational force from Earth.
17

The gravitational force between two objects is 2400 N. What will be the gravitational force between the objects if the mass of one object is doubled?

A
600 N
B
1200 N
C
4800 N
D
9600 N
18

How high above Earth is a satellite orbiting if its tangential velocity is 5000 m/s? Earth’s mass is kg and its radius is m.

Question illustration
A
1,500,000 m
B
2,240,000 m
C
9,608,000 m
D
16,008,000 m
19

Which best explains why astronauts appear weightless when they are in a space shuttle orbiting Earth?

A
They are falling toward Earth at the same rate as the space shuttle.
B
They are falling toward Earth at a faster rate than the space shuttle.
C
They are too far from Earth to experience gravity.
D
They are too far from Earth to experience air resistance.
20

Which changes would result in a decrease in the gravitational force between two objects? Check all that apply.increasing the distance between the objectsdecreasing the distance between the objectsincreasing the mass of one of the objectsincreasing the mass of both objectsdecreasing the mass of one of the objectsdecreasing the mass of both objects

A
increasing the distance between the objects
B
decreasing the distance between the objects
C
increasing the mass of one of the objects
D
increasing the mass of both objects
E
decreasing the mass of one of the objects
F
decreasing the mass of both objects

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