AnswersDCSS Physics CR 24-25Unit Test

Unit Test — Unit test Answers

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The gravitational force between Pluto and Charon is 3.61 × 1018 N. Pluto has a mass of 1.3 × 1022 kg, which is only slightly greater than Charon’s mass of 1.6 × 1021 kg.

A
2.0 × 107 m
B
2.4 × 1012 m
C
3.8 × 1014 m
D
5.8 × 1024 m
2
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The tip of a pinwheel is 0.24 m from the center. The pinwheel spins 5 times each second. What is the tangential speed of the tip of the pinwheel?

A
0.30 m/s
B
1.2 m/s
C
1.5 m/s
D
7.5 m/s
3

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
4

Lexy used the formula shown to calculate the force of gravity on a space shuttle.Fg = G

Question illustration
A
the difference between Earth’s mass and the space shuttle’s mass
B
the sum of Earth’s mass and the space shuttle’s mass
C
the mass of Earth
D
the mass of the space shuttle
5

Kepler’s first law states that the orbits of planets are ellipses with the Sun at one .

Answer not available
6

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
7

The seasons of the year result from Earth’s movement, or , around the Sun.

Answer not available
8

A jogger runs 5.0 km on a straight trail at an angle of 60° south of west. What is the southern component of the run rounded to the nearest tenth of a kilometer?

A
-4.3 km
B
-2.5 km
C
2.5 km
D
4.3 km
9

Two objects have the same center point of the circle, but are located at different positions away from the center point. Each object is moving with uniform circular motion.Which would describe the tangential speed of the objects?

A
both objects would have the same tangential speed
B
the object with the smaller radius has a faster tangential speed
C
the object with the larger radius has a faster tangential speed
D
both objects would have oscillating tangential speeds
10

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
11

Which changes would result in a decrease in the gravitational force between two objects? Check all that apply.

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
12

Which situation during a basketball game involves centripetal acceleration?

A
The official tosses the ball up for the opening tip-off.
B
A player passes the ball to another player.
C
The basketball bounces off the backboard.
D
A player spins a basketball on his finger.
13

A projectile is launched at a 30° angle relative to the ground. The projectile has an initial velocity of 15 m/s and travels through the air for 2 seconds.The horizontal displacement of the projectile, rounded to the nearest hundredth, is m.

Answer not available
14

Two vectors, X and Y, form a right angle. Vector X is 48 inches long and vector Y is 14 inches long. The length of the resultant vector is inches.

Answer not available
15

The diagram shows three different bicycle routes taken by Frank, Alexis, and Juan to get to the electronics store.According to the diagram, Juan traveled kilometers.

Answer not available
16

What must be true of a force that causes an object to move in a circular motion?

A
It acts parallel to the velocity and is directed toward the center of the circle.
B
It acts parallel to the velocity and is directed away from the center of the circle.
C
It acts perpendicular to the velocity and is directed toward the center of the circle.
D
It acts perpendicular to the velocity and is directed away from the center of the circle.
17

Study the vector diagram.

Question illustration
A
54 cm
B
72 cm
C
5184 cm
D
5625 cm
18

The diagram shows three vectors.

Question illustration
A
Option
Option A
B
Option
Option B
C
Vectors P and Py are components of vector Px.
D
Vectors Px and Py are components of vector P.
19

The solar mass of the Sun is 1. The orbital period of Jupiter is 11.9 Earth years.

A
5.2 AU
B
41 AU
C
52 AU
D
410 AU
20

Which formula can be used to calculate the horizontal displacement of a horizontally launched projectile?

A
x = vi(cos )
Option A
B
x = vi(sin )t
Option B
C
x = ayt
Option C
D
x = vxt
Option D

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