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Cumulative Exam — Cumulative exam Answers

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What is the first way in which biology researchers present the results of their latest research?

A
through an article published in the newspaper
B
through an e-mail addressed to the scientific community
C
through an interview given to a local TV news reporter
D
through an article published in a scientific journal
24
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A puppy finds a rawhide bone and begins to pull it with a force, Ft. The free-body diagram is shown.

Question illustration
A
It begins to move toward the right.
B
It stays in static equilibrium.
C
It stays in dynamic equilibrium.
D
It begins to move toward the left.
25

A car with a mass of 1,500 kg requires a centripetal force of 640 N to safely follow a circular curve in the road at 13.4 m/s.

A
31 m
B
77 m
C
421 m
D
860 m
26

Four springs are stretched to the same distance from the equilibrium position. The spring constants are listed in the table.

Question illustration
A
X, Y, W, Z
B
X, W, Y, Z
C
Z, W, Y, X
D
Z, Y, W, X
27

A scientist wants to perform a controlled experiment to test the effect of rust on chemically treated iron. Which action would be most important to perform in a controlled experiment?

A
Design an experiment that is based on previously published results.
B
Expose the treated iron to the corrosive effects of the air.
C
Test a large piece of treated iron and a small piece of untreated iron.
D
Test a piece of treated iron and a piece of untreated iron under the same conditions.
28

A hot air balloon pilot wants the balloon to quickly rise several feet higher so it will be above some trees in the distance. Which best explains how the pilot can make the balloon rise?

A
The pilot can adjust the temperature inside the balloon so it is equal to the temperature of the surrounding air.
B
The pilot can adjust the density of the air inside the balloon so it is equal to the density of the surrounding air.
C
The pilot can decrease the temperature inside the balloon so it is cooler than the surrounding air.
D
The pilot can increase the temperature inside the balloon so it is warmer than the surrounding air.
29

The gravitational force between two objects is 1600 N. What will be the gravitational force between the objects if the distance between them doubles?

A
400 N
B
800 N
C
3200 N
D
6400 N
30

Which best describes the heat that you can feel on the engine of a running car?

A
The heat is unusable and absorbed by the engine.
B
The heat is usable and absorbed by the engine.
C
The heat is unusable and lost to the surroundings.
D
The heat is usable and lost to the surroundings.
31

In an investigation that uses the scientific method, which step immediately follows making a hypothesis?

A
summarizing the results
B
asking a question
C
making observations
D
designing an experiment
32

A train travels 600 km in 4 hours. What is the speed of the train?

A
0.007 km/h
B
604 km/h
C
150 km/h
D
2,400 km/h
33

The power ratings of several motors are listed in the table.An advertising agency writes marketing material for a new motor (Brand W) that has a power rating of 7,640 W. Which statement comparing the motors can they truthfully use?

Question illustration
A
Brand W motor can finish any job faster than Brand Y motor can.
B
There’s not a more powerful motor available.
C
Brand W motor does more work each second than Brand X or Brand Z.
D
Every second, Brand W motor does 7,640 N of your toughest work.
34

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
35

A car moving south speeds up from 10 m/s to 40 m/s in 15 seconds. What is the car’s acceleration?

A
2 m/s2
B
15 m/s2
C
30 m/s2
D
50 m/s2
36

A block slides down a rough ramp with a 30-degree incline as shown.Which diagram represents the forces acting on the block?

Question illustration
A
Option
B
Option
C
Option
D
Option
37

What is the most likely reason that a hypothesis would be useful even if experiments show that it is false?

A
New hypotheses and experiments can be developed that better fit the observations made during the original experiments.
B
Many new experiments could be designed and conducted to gather more evidence that the hypothesis is false.
C
Scientists can know that there is no relationship between the dependent and independent variables being tested.
D
The field of study can be ignored because it has proven to be untestable by scientific standards.
38

When a baseball player catches a baseball, the glove "gives" or moves backward. How does this movement affect the change in momentum of the baseball?

A
The change in momentum increases because the impact time increases.
B
The change in momentum decreases because the force decreases.
C
The change in momentum stays the same because the ball still comes to a stop.
D
The change in momentum depends on the initial speed of the ball and the time to stop.
39

A car manufacturer wants to change its car’s design to increase the car’s acceleration. Which changes should the engineers consider making to the design?

A
increase the force that the engine provides
B
decrease the force that the engine provides
C
increase the mass of the car
D
decrease the mass of the car
E
increase the top velocity the car can travel
F
decrease the top velocity the car can travel
40

Rebekah finds that a solution of sugar in water has a volume of 1.32 fl. oz. How should she report this amount using the metric system? (1 fl. oz. = 29.6 mL)

A
0.403 m
B
1.40 qt
C
37.5 g
D
39.1 mL
41

Ronnie kicks a playground ball with an initial velocity of 16 m/s at an angle of 40° relative to the ground. What is the approximate horizontal component of the initial velocity?

A
0.64 m/s
B
0.77 m/s
C
10.3 m/s
D
12.3 m/s
42

A velocity vs. time graph for an object is shown.

Question illustration
A
constant and positive
B
constant and negative
C
changing and positive
D
changing and negative

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