AnswersTX-Physics BCumulative Exam

Cumulative Exam — Cumulative exam Answers

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22
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A circuit is built based on this circuit diagram.

Question illustration
A
0.61 Ω
B
1.6 Ω
C
7.5 Ω
D
18 Ω
23
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On an ice skating rink, a girl of mass 50 kg stands stationary, face to face with a boy of mass 80 kg. The children push off of one another, and the boy moves away with a velocity of +3 m/s.

A
–1.9 m/s
B
+1.9 m/s
C
–4.8 m/s
D
+4.8 m/s
24

The image shows the right-hand rule being used for a current-carrying wire.

Question illustration
A
When the current flows down the wire, the magnetic field flows out on the left side of the wire and in on the right side of the wire.
B
When the current flows up the wire, the magnetic field flows out on the left side of the wire and in on the right side of the wire.
C
When the current flows down the wire, the magnetic field flows in on the left side of the wire and out on the right side of the wire.
D
When the current flows up the wire, the magnetic field flows in on the left side of the wire and out on the right side of the wire.
25

A ray diagram without the produced image is shown.

Question illustration
A
real and larger than the object
B
real and smaller than the object
C
inverted and larger than the object
D
upright and larger than the object
26

The two waves shown here are the same distance from point X and are traveling toward each other.

Question illustration
A
0.0 cm
B
1.0 cm
C
2.0 cm
D
4.0 cm
27

A –0.06 C charge is placed is in a uniform electric field with a strength of 200 N/C. What is the magnitude and direction of the force on the charge?

A
12 N in the opposite direction of the field
B
12 N in the same direction of the field
C
3333 N up in the opposite direction of the field
D
3333 N in the same direction of the field
28

The wave shown below is produced in a rope.Which shows the motion of the rope at Point P as the wave passes through it?

Question illustration
A
A dot with a vector drawn right and a vector drawn left.
Option A
B
A dot vector drawn up and vector drawn down.
Option B
C
A dot with a vector drawn up to the right and a vector drawn down to the left.
Option C
D
A dot with a vector drawn up to the left and a vector drawn down to the right.
Option D
29

Tony uses the device shown in the diagram to model how an electromagnet is used in his uncle’s scrap metal yard.

Question illustration
A
removing the battery
B
removing the iron nail
C
moving the wire loops closer together
D
spreading the wire loops farther apart
30

The ratio of coils of wire in the primary winding to the secondary winding of a transformer is 3:2. How does the transformer change the voltage of a current applied to the primary winding?

A
It increases to three-halves times the original.
B
It decreases to two-thirds the original.
C
It increases to three times the original.
D
It decreases to one-third the original.
31

The ray diagram shows a vase that is placed beyond the center of curvature of a concave mirror.

Question illustration
A
It will be larger than the vase and upright.
B
It will be smaller than the vase and upright.
C
It will be larger than the vase and inverted.
D
It will be smaller than the vase and inverted.
32

A photon has a frequency of 7.3 × 10–17 Hz. Planck’s constant is 6.63 × 10–34 J•s. The energy of the photon, to the nearest tenths place, is × 10–50 J.

Answer not available
33

Which are characteristics of a ray when it hits a boundary and reflects, but not when it hits the boundary and refracts? Check all that apply.changes direction changes speeddoes not change directiondoes not change speed bounces off the boundarypasses through the boundary

A
changes direction
B
changes speed
C
does not change direction
D
does not change speed
E
bounces off the boundary
F
passes through the boundary
34

Which electromagnetic wave transfers the least amount of energy?

A
gamma
B
X-ray
C
ultraviolet
D
microwave
35

A bell is rung. What best describes the density of air around the bell?

A
The air density does not change.
B
The air density increases and then returns to normal levels.
C
The air density decreases and then returns to normal levels.
D
The air density increases and decreases repeatedly before returning to normal.
36

What is the resistance in a circuit that carries a 0.75 A current when powered by a 1.5 V battery?

A
0.50 Ω
B
1.1 Ω
C
2.0 Ω
D
2.3 Ω
37

Question text not available

Answer not available
38

A 6 cm object is 15 cm from a convex lens that has a focal length of 5 cm. What is the distance of the image from the lens, to the nearest hundredth?

A
–33.33 cm
B
–7.50 cm
C
7.50 cm
D
33.33 cm
39

A car makes sound as it moves toward a stationary observer. What best describes the sound wave heard by the observer compared with the sound heard by the car’s driver?

A
higher frequency; shorter wavelength
B
higher frequency; longer wavelength
C
lower frequency; shorter wavelength
D
lower frequency; longer wavelength
40

Which statements correctly describe the effect of distance in determining the gravitational force and the electrical force? Check all that apply.The gravitational force has an infinite reach.The electrical force has an infinite reach.The gravitational force is inversely proportional to the distance.The electrical force is inversely proportional to the distance.The gravitational force is inversely proportional to the square of the distance.The electrical force is inversely proportional to the square of the distance.

A
The gravitational force has an infinite reach.
B
The electrical force has an infinite reach.
C
The gravitational force is inversely proportional to the distance.
D
The electrical force is inversely proportional to the distance.
E
The gravitational force is inversely proportional to the square of the distance.
F
The electrical force is inversely proportional to the square of the distance.
41

Which best explains why infrared waves are ineffective for treating cancer?

A
They have frequencies that are too high to kill cancer cells.
B
They have short wavelengths, which can be harmful to healthy cells.
C
They do not transfer enough energy to destroy cancer cells.
D
They have long wavelengths, which can be harmful to healthy cells.

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