Answers2003390-Physics 1 Honors Sem. 1 - PetersUnit Test

Unit Test — Unit test Answers

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1
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The chart shows the speeds at which four objects are launched into the air.

Question illustration
A
W and Y
B
X and Y
C
Y and Z
D
W and Z
3
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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
4

Rosa uses the formula (vi cos)t to do a calculation. Which value is Rosa most likely trying to find?

Question illustration
A
the vertical acceleration of a projectile launched at an angle
B
the vertical acceleration of a projectile launched horizontally
C
the horizontal displacement of a projectile launched at an angle
D
the horizontal displacement of a projectile launched horizontally
5

How is the gravitational force related to the distance between two objects?

A
It is directly proportional to the square of the distance.
B
It is inversely proportional to the square of the distance.
C
It is directly proportional to the distance.
D
It is inversely proportional to the distance.
6

A group of scientists is trying to launch an object into orbit, and the object is traveling at 6500 m/s. Which best explains why the object will not successfully orbit Earth?

A
There is not enough air resistance to keep the object moving.
B
There is not enough friction to keep the object moving.
C
The object is not traveling fast enough to match Earth’s curvature.
D
The object is traveling too fast to match Earth’s curvature.
7

Which statements describe the relationship of Earth and its moon? Check all that apply.

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.
8

[BLANK]

A
diagonal
B
parabolic
C
perpendicular
D
tangential
9

What is the only force acting on an object orbiting Earth?

A
air resistance
B
friction
C
inertia
D
gravity
10

Which best describes how Johannes Kepler developed his laws of planetary motion?

A
He calculated the gravitational force on orbiting bodies.
B
He debated with Copernicus who proposed the heliocentric model.
C
He examined the motions of planets through a telescope.
D
He analyzed data collected by Tycho Brahe.
11

Study the vector diagram.

Question illustration
A
Tx - Ux - Vx
B
Tx + Ux + Vx
C
Tx = Tcosθ
D
Tx = Tsinθ
12

The gravitational force between two objects is 2000 N. The mass of each object is reduced to one-third of its original mass.

A
The distance must be one-ninth the original distance.
B
The distance must be one-third the original distance.
C
The distance must be three times greater.
D
The distance must be nine times greater.
13

The diagram shows vectors that are not perpendicular to one another.The data table shows the magnitudes of the components of each displacement vector.

Question illustration
A
0.1°
B
10.0°
C
36.9°
D
41.1°
14

Phobos orbits Mars in 27,553 s at a distance of 9.378 × 106 m. What is the mass of Mars?

A
2.58 × 1011 kg
B
2.05 × 1023 kg
C
6.43 × 1023 kg
D
1.09 × 1030 kg
15

Mohammed made a chart to list examples and nonexamples of projectile motion.Which best completes the chart?

Question illustration
A
a football thrown in the air
B
a kite flying on a string
C
a golf ball rolling off a table
D
water spraying from a fountain
16

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.
17

Which are the effects of gravity on objects on the surface of Earth? Select 2 options.

A
Objects “fall” toward the center of Earth.
B
Objects are pulled by Earth but do not pull on Earth.
C
Objects accelerate at a rate of 9.8 m/s each second.
D
Objects travel at a rate of 9.8 m/s toward the center of Earth.
E
Objects pull on the Earth is much stronger than the Earth’s pull on the object.
19

The diagram shows components that have been added together to form Rx and Ry. Rx and Ry are the components of the resultant vector.

Question illustration
A
R2 = Rx2 + Ry2
B
R = Rx + Ry
C
R = Rx(cosθ)
D
R = Rx(sinθ)
20

A ball that has a mass of 0.25 kg spins in a circle at the end of a 1.6 m rope. The ball moves at a tangential speed of 12.2 m/s.

A
1.9 N
B
23 N
C
59 N
D
93 N
21

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
22

Sung rolls a marble off the edge of a table. She rolls the marble off the same table again but at a different speed.

A
The marble’s horizontal and vertical velocities change.
B
The marble’s horizontal and vertical velocities remain the same.
C
The marble’s vertical velocity changes, but its horizontal velocity does not.
D
The marble’s horizontal velocity changes, but its vertical velocity does not.

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