AnswersBHS-Physics A-CR w Prescriptive TestUnit Test

Unit Test — Unit test Answers

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1
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The acceleration due to gravity on Mercury is 3.7 m/s2, which is about six times the acceleration due to gravity on Pluto.

A
An object weighs about one-sixth as much and has about one-sixth the mass on Pluto as on Mercury.
B
An object weighs about one-sixth as much but has the same mass on Pluto as on Mercury.
C
An object weighs the same but has about one-sixth the mass on Pluto as on Mercury.
D
An object weighs the same and has the same mass on Pluto as on Mercury.
2
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A bicycle tire has a radius of 0.23 m. The tire spins at a constant speed with a centripetal acceleration of 42 m/s2.

A
3.1 m/s
B
6.5 m/s
C
9.7 m/s
D
14 m/s
3

Which statement is supported by Kepler’s laws?

A
The closer a planet is to the Sun, the faster it moves.
B
The farther a planet is from the Sun, the faster it moves.
C
As a planet moves away from the Sun, its gravitational force increases.
D
As a planet moves away from the Sun, its gravitational force remains the same.
4

A child on a spinning ride at a playground has a centripetal acceleration of 0.80 m/s2. The child completes a full circle every 4.2 s.

A
0.068 m
B
0.085 m
C
0.27 m
D
0.36 m
5

The image shown is an illustration of Kepler’s second law.

Question illustration
A
The gravitational force at W is less than the gravitational force at Y.
B
The time needed to travel from W to X is the same as the time needed to travel from Y to Z.
C
The gravitational force at W is the same as the gravitational force at Y.
D
The time needed to travel from W to X is greater than the time needed to travel from Y to Z.
6

Hakeem wants to explain why only one side of the moon is visible from Earth. Which comparison would provide the best support?

A
the orbital period of Earth with the rotational period of the moon
B
the orbital period of the moon with the rotational period of the moon
C
the orbital period of the moon with the rotational period of the Earth
D
the orbital period of Earth with the orbital period of the moon
7

What did Johannes Kepler contribute to the study of planets?

A
He formulated the universal law of gravitation.
B
He identified the first moons of Jupiter.
C
He collected detailed data that led to the proposal of the heliocentric model.
D
He provided mathematical support for the heliocentric model.
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

A cyclist rides at a constant speed of 4.5 m/s around a curve. If the centripetal acceleration is 29 m/s2, what is the radius of the curve?

A
0.16 m
B
0.70 m
C
6.4 m
D
34 m
10

The pitcher on a softball team starts a windup to throw a pitch, as shown.Note: In softball, the ball is pitched underhand in a circular motion in the direction of the arrow.

Question illustration
A
W
B
X
C
Y
D
Z
11

The table shows data for the planet Uranus.

Question illustration
A
170 N
B
218 N
C
430 N
D
532 N
12

The orbital period of a satellite is 2 × 106 s and its total radius is 2.5 × 1012 m. The tangential speed of the satellite is m/s. (Round to the nearest whole number, do not add any punctuation.)

Answer not available
13

Cecelia dropped a ball from a height of 2 m. The ball fell in a straight path down to the ground.

A
tossing it horizontally at a slower speed
B
tossing it horizontally at a faster speed
C
dropping it from a shorter distance
D
dropping it from a greater distance
14

Which formula can be used to find the centripetal acceleration of an orbiting object?

A
ac =
Option A
B
ac =
Option B
C
ac =
Option C
D
ac =
Option D
15

The gravitational force between two asteroids is 6.2 × 108 N. Asteroid Y has three times the mass of asteroid Z.

A
3.7 × 1015 kg
B
1.1 × 1016 kg
C
1.4 × 1031 kg
D
4.1 × 1031 kg

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