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Cumulative Exam — Cumulative exam Answers

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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
42
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Once started, why can nuclear fission continue to occur on its own?

A
The thermal energy released can cause the products to join.
B
The neutron formed by the reaction can cause more nuclei to combine.
C
The thermal energy released can cause the products to split.
D
A neutron begins the reaction, and more neutrons are formed in it.
43

Which factors affect the strength of a magnetic field around a current-carrying wire? Check all that apply.the type of metal of the wirethe amount of the currentthe direction of the currentthe temperature of the wirethe distance from the wire

A
the type of metal of the wire
B
the amount of the current
C
the direction of the current
D
the temperature of the wire
E
the distance from the wire
44

Karen is running forward at a speed of 9 m/s. She tosses her sweaty headband backward at a speed of 20 m/s. The speed of the headband, to the nearest whole number relative to a stationary observer watching Karen, is m/s.

Answer not available
45

A ray of light strikes a smooth surface and is reflected. The angle of incidence is 35°.

A
Rays will bounce in all directions, so the angle of reflection will be random.
B
Rays will bounce in all directions, so the angle of reflection will be less than 35°.
C
Rays will follow the law of reflection, so the angle of reflection will be 35°.
D
Rays will follow the law of reflection, so the angle of reflection will be random.
46

Consider this image of a wave.

Question illustration
A
A graph with time in second on the x axis from 0 to 8 and amplitude on the y axis from 2 to 2. The wave starts at the origin and the trough goes up to .8, back down through .75 s and all the way down to 2 before going back up to 2 on the other side of the x axis. It is a repeated pattern with on trough and 3 crests with different amplitude.
Option A
B
A graph with time in second on the x axis from 0 to 8 and amplitude on the y axis from 2 to 2. The wave starts at the origin and the trough goes down to 2, back up through 1 s and all the way up to .7 before going back down to .2 on the other side of the x axis. It is a repeated pattern with on trough and 3 crests with different amplitude.
Option B
C
A graph with time in second on the x axis from 0 to 8 and amplitude on the y axis from 2 to 2. The wave starts at the origin and the trough goes down to .6, back up through 1s and all the way up to .6 before going back down to .4 on the other side of the x axis. It is a repeated pattern with on trough and 3 crests with different amplitude.
Option C
D
A graph with time in second on the x axis from 0 to 8 and amplitude on the y axis from 2 to 2. The wave starts at the origin and the trough goes down to 2, back up through 1s and all the way up to .7 before going back down to .2 on the other side of the x axis. Then back up to .3 on the other side of the x axis. The pattern repeats itself but flipped on the x axis
Option D
47

The presence of which magnetic feature best explains why a magnet can act at a distance on other magnets or on objects containing certain metals?

A
fields
B
dipoles
C
domains
D
forces
48

How are nuclear reactions used to meet the world’s energy needs?

A
Both fusion and fission are used to generate electricity, but more fission reactors than fusion reactors are in use.
B
Fission reactors are used to generate electricity, but fusion is not yet practical enough to be used.
C
Both fusion and fission are used to generate electricity, but more fusion reactors than fission reactors are in use.
D
Fusion reactors are used to generate electricity, but fission is not yet practical enough to be used.
49

Ten students stand in a circle and are told to make a transverse wave. What best describes the motion of the students?

A
Each student bumps the shoulder of his or her neighbor.
B
At the exact time, all students take a step to the right.
C
The students skip clockwise, going in a circular motion.
D
One at a time, each student lifts his or her hands up and then down.
50

Which formula represents Snell’s law?

A
n Subscript 1 Baseline plus sin theta Subscript 1 equals n Subscript 2 Baseline plus sin theta Subscript 2
Option A
B
Option
Option B
C
Option
Option C
D
Option
Option D

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