AnswersCrowley Original Credit Chemistry BTypes of Radioactive Decay

Types of Radioactive Decay — Unit test Answers

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1
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The graph represents velocity vs. time for Carla.

Question illustration
A
Carla sped up in the beginning of her trip, stopped, and then slowed down.
B
Carla had a greater acceleration in the beginning than in the end.
C
Carla slowed down in the beginning of her trip, stopped, and then sped up.
D
Carla had a continuous acceleration throughout the entire trip.
2
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Katie rolls a toy car off the end of a table.Which path will the car follow when it leaves the table?

Question illustration
A
A
B
B
C
C
D
D
3

Koto traveled 5,000 meters north from her house with an average velocity of 4.5 m/s.What was the time of her trip? (There are 60 seconds in 1 minute.)

1
18.5 minutes
2
20.4 minutes
2
2 hours
3
3 hours
4

Which refers to an object’s resistance to any change in its motion?

A
force
B
acceleration
C
gravity
D
inertia
5

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
6

What kind of acceleration occurs when an object speeds up?

A
positive
B
negative
C
neutral
D
zero
7

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
B
Max Xander Finley
C
Xander Finley Max
D
Finley Xander Max
8

A scientist on Earth drops a hammer and a feather at the same time an astronaut on the moon drops a hammer and a feather.

A
The hammer hits the ground before the feather on both Earth and the moon.
B
The hammer hits the ground before the feather on Earth, but the feather hits the ground first on the moon.
C
The hammer and the feather hit the ground together on both Earth and the moon.
D
The hammer hits the ground before the feather on Earth, and the hammer and feather hit at the same time on the moon.
9

Which best describes friction?

A
a downward pull when objects fall through the air
B
a constant force that acts on objects that rub together
C
a downward pull on objects that roll on bumpy surfaces
D
a constant force that pulls two objects toward each other
10

The table represents the speed of a car in a northern direction over several seconds.

Question illustration
C
Column 1 should be titled “Time,” and Column 2 should be titled “Velocity.”
C
Column 1 should be titled “Velocity,” and Column 2 should be titled “Time.”
C
Column 1 should be titled “Time,” and Column 2 should be titled “Acceleration.”
C
Column 1 should be titled “Acceleration,” and Column 2 should be titled “Time.”
11

best

H
His speed was 1 m/s, and his velocity was 0.
H
His speed was 2 m/s, and his velocity was 0.
H
His speed was 1 m/s, and his velocity was 1 m/s north.
H
His speed was 2 m/s, and his velocity was 2 m/s south.
12

The information in the table represents the effect of the mass of two objects on the gravitational force between the two objects.Which number should be in the cell with the question mark?

Question illustration
A
The number is two because when you double the mass of one of the objects, the force between the objects is halved.
B
The number is four because when you double the mass of one of the objects, the force between the objects remains the same.
C
The number is eight because when you double the mass of one of the objects, the force between the objects also doubles.
D
The number is sixteen because when you double the mass of one of the objects, the force between the objects increases by a factor of 4.
13

Which piece of furniture will have the most inertia and give the furniture movers the most difficulty in moving?

A
a 50kg couch
B
a 5kg dining chair
C
a 75kg dining table
D
an 10kg end table
14

best

i
increasing the inertia of the car
d
decreasing the reaction force
i
increasing the action force
d
decreasing the mass of the car
15

Which describes an object’s speed when free falling in a vacuum?

A
The object accelerates until it reaches its terminal velocity.
B
The object falls at a constant speed because only one force acts on it.
C
The object falls faster and faster until it strikes the ground.
D
The object speeds up and then stops when air resistance equals gravity.

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