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Cumulative Exam — Cumulative exam Answers

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Xander reached a final velocity of 4.5 m/s in 3.5 seconds. Finley reached a final velocity of 3.6 m/s in 4.2 seconds. Max reached a final velocity of 7.3 m/s in 1.2 seconds. They all started at the same location from rest.

A
Max Finley Xander
Option A
B
Max Xander Finley
Option B
C
Xander Finley Max
Option C
D
Finley Xander Max
Option D
2
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A 4400 W motor is used to do work. If the motor is used for 200 s, how much work could it do? (Power: P = W/t)

A
22 J
B
4200 J
C
4600 J
D
880,000 J
3

What must be included when describing the displacement of an object?

A
measurement and direction
B
direction and speed
C
total distance and position
D
speed and total distance
4

Which condition must be met for conduction to occur?

A
particles must be large
B
particles must be small
C
particles must be in contact
D
particles must be spread apart
5

What kind of acceleration occurs when an object speeds up?

A
positive
B
negative
C
neutral
D
zero
6

Which provides resistance in an electric circuit?

A
wire
B
light bulb
C
battery
D
switch
7

What is the advantage of saving for 5 years to pay the total price for a car, over buying the car today using a 5-year loan?

A
avoiding interest payments
B
paying less interest
C
spreading out payments over time
D
building one’s credit
8

Dimas reads that it takes 270 N to lift a firefighter’s equipment. If a firefighter does 5400 J of work carrying the equipment up a staircase, how high does the firefighter climb? (Work: W = Fd)

A
20 m
B
200 m
C
5130 m
D
1,458,000 m
9

Review the table, which shows a credit card statement.

Question illustration
A
$5,000
B
$425
C
$550
D
$80
10

Look at the circuit diagram.

Question illustration
A
one
B
two
C
three
D
four
11

Which situation would result in interference?

A
a wave bouncing off an object
B
a wave bending as it moves through an object
C
a wave scattering as it moves through an object
D
a wave increasing in energy as it hits another wave
12

Bees can see into the ultraviolet region of the electromagnetic spectrum. Compared with humans, bees can sense electromagnetic waves that have

A
a lower frequency and a shorter wavelength.
B
a higher frequency and a longer wavelength.
C
a lower frequency and a longer wavelength.
D
a higher frequency and a shorter wavelength.
13

The energy of microwaves is less than the energy of ultraviolet light. Which comparison of the energies of electromagnetic waves is correct?

A
Gamma rays have higher energy than microwaves because gamma rays have shorter wavelengths.
B
Gamma rays have higher energy than microwaves because gamma rays have lower frequencies.
C
Infrared light has lower energy than X-rays because infrared light has shorter wavelengths.
D
Infrared light has lower energy than X-rays because infrared light has higher frequencies.
14

A circuit has a current of 2 A. If the resistance in the circuit decreases to one-fourth of its original amount while the voltage remains constant, what will be the resulting current?

A
0.5 A
B
2 A
C
4 A
D
8 A
15

Levi and Clara are trying to move a very heavy box. Levi is pushing the box with a force of 30 N, and Clara is pulling the box with a force of 50 N. The box exerts a frictional force of 65 N.

A
There is a net force of 15 N against them and they cannot move the box.
B
There is a net force of 15 N allowing Levi and Clara to move the box.
C
There is a net force of 65 N against them and they cannot move the box.
D
There is a net force of 80 N allowing Levi and Clara to move the box.
16

Measurements of two electric currents are shown in the chart.

Question illustration
A
Current X has a greater potential difference, and the charges flow at a slower rate.
B
Current Y has a greater potential difference, and the charges flow at a slower rate.
C
Current X has a greater potential difference, and the charges flow at a faster rate.
D
Current Y has a greater potential difference, and the charges flow at a faster rate.
17

A circuit has a current of 1.2 A. If the voltage decreases to one-third of its original amount while the resistance remains constant, what will be the resulting current?

A
0.3 A
B
0.4 A
C
1.2 A
D
3.6 A
18

Which shows the formula for converting from kelvins to degrees Celsius?

A
°C = (9/5 × K) +32
B
°C = 5/9 × (K – 32)
C
°C = K – 273
D
°C = K + 273
19

Kyle has a mass of 54 kg and is jogging at a velocity of 3 m/s. What is Kyle’s kinetic energy? (Formula: )

Question illustration
A
18 J
B
81 J
C
162 J
D
243 J
20

The diagram shows two charged objects, A and B.

Question illustration
A
A: positiveB: negative
B
A: negativeB: positive
C
A: negativeB: negative
D
A: positiveB: positive

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