Answers25-26 TX-Physics B-CRLab: Electromagnetic Induction

Lab: Electromagnetic Induction — Cumulative exam Answers

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1
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A 150 g egg is dropped from 3.0 meters. The egg is moving at 4.4 m/s right before it hits the ground. The egg comes to a stop in 0.072 seconds.

A
0.66 N
B
9.2 N
C
13 N
D
180 N
2
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Which device converts kinetic energy into electrical energy?

A
an electric generator
B
an electric motor
C
a step-down transformer
D
a step-up transformer
3

Lucas makes a graphic organizer to compare ways electrical energy is produced.

Question illustration
A
X: Uses turbines to turn generatorsY: Boils water to form steam
B
X: Boils water to form steamY: Uses turbines to turn generators
C
X: Uses uraniumY: Uses falling water to turn turbines
D
X: Uses generators to produce electrical energyY: Burns fuel to form steam
4

What best describes white light as it travels through a prism? Check all that apply.

A
The light slows down.
B
The light bends in the prism.
C
Light reflects off of the surface of the prism.
D
The speed of light in the prism is 3.0 × 108 m/s.
E
The white light breaks into its component colors.
5

Ultraviolet light from a distant star is traveling at 3.0 × 108 m/s. How long will it take for the light to reach Earth if it must travel 4.0 × 1013 km?

A
2.7 × 10–2 hours
B
2.2 × 103 hours
C
3.7 × 104 hours
D
1.3 × 105 hours
6

An incident ray of light strikes a diamond at an angle of 45°. The index of refraction of air is 1.0003 and the index of refraction of a diamond is 2.42.

A
2°
B
17°
C
19°
D
45°
7

What does the index of refraction directly measure?

A
the angle between the incident ray and the normal line
B
the angle between the refracted ray and the normal line
C
the bending of light in a medium
D
the reflection of light in a medium
8

A student is working in a lab to determine how time affects impulse. The student keeps the force the same in each trial but changes the impact time. Some data is shown.

Question illustration
A
trial 1
B
trial 2
C
trial 3
D
trial 4
9

Charges of +3 µC and –5 µC are 2 mm from each other. The –5 µC charge is replaced with a +5 µC charge.

A
same force, but in the opposite direction
B
same force, but in the same direction
C
greater force, but in the opposite direction
D
greater force, but in the same direction
10

Following an inelastic collision, what can kinetic energy be converted into? Check all that apply.heatimpulsemomentumpotential energysound

A
heat
B
impulse
C
momentum
D
potential energy
E
sound
11

The table lists the time it takes for an amount of charge to pass through a point in a wire. Janelle is exploring the relationship between the brightness of a light bulb and the current that powers it. When applying these currents to the same bulb, the bulb is brighter when the current is greater.Which lists the currents in the order of the bulb brightness they cause from most bright to least bright?

Question illustration
A
W, Y, X, Z
B
Y, W, Z, X
C
W, Y, Z, X
D
X, Z, W, Y
12

The table below shows the speed of sound waves from musical sound sources at 20°C.Which conclusion can be made based on the information in the table?

Question illustration
A
Wave speed and wavelengths can vary inversely to produce the same frequency.
B
Frequency and wave speed can vary directly to produce the same wavelength.
C
Wavelengths and frequency can vary inversely to produce the same wave speed.
D
Frequency and wavelengths can vary directly to produce the same wave speed.
13

A longitudinal wave is shown.

Question illustration
A
A
B
B
C
C
D
D
14

A gas water heater is 75% efficient. The energy output used to heat the water is 4.6 kWh.

A
3.5 kWh
B
5.4 kWh
C
6.1 kWh
D
16.3 kWh
15

How does an airbag help protect a passenger in a car following a car accident?

A
It shortens the passenger’s stopping time, and this decreases the force.
B
It shortens the passenger’s stopping time, and this increases the force.
C
It increases the passenger’s stopping time, and this decreases the force.
D
It increases the passenger’s stopping time, and this increases the force.
16

What is the purpose of the metal core in an electromagnet?

A
It is magnetized and induces a current in the solenoid to decrease the magnetic field strength.
B
It is magnetized and induces a current in the solenoid to increase the magnetic field strength.
C
It is magnetized by the field of the solenoid and increases the magnetic field strength.
D
It is magnetized by the field of the solenoid and decreases the magnetic field strength.
17

The diagram shows the electric field around two charged objects.

Question illustration
A
W: PositiveX: Positive
B
W: NegativeX: Negative
C
W: NegativeX: Positive
D
W: PositiveX: Negative
18

Arnold makes a chart to summarize what happens when light interacts with matter and is reflected.Which idea does Arnold need to correct?

Question illustration
A
In specular reflection, reflected rays move in the same direction.
B
In scattering, light strikes particles in the atmosphere.
C
In diffuse reflection, reflected rays move in different directions.
D
In scattering, long wavelengths are scattered the most.
19

Current X is 2.5 A and runs for 39 seconds. Current Y is 3.8 A and runs for 24 seconds.Which current delivered more charge, and how much more charge did it deliver?

A
X delivered 97.5 C more than Y.
B
X delivered 6.3 C more than Y.
C
Y delivered 91.2 C more than X.
D
Y delivered 1.3 C more than X.
20

Trent builds a model electric motor. When he connects a battery to the motor, the motor spins through a half rotation and stops.

A
replacing the battery, because it is not providing current
B
installing new brushes, because they are not making a good connection
C
checking the commutator, because the current is not reversing
D
adding more wire coils in the armature, because the electromagnet is too weak

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