PHYS 165 Final Exam Questions with Correct Answers Graded A+
Exam 1 - Answers
Which statement best describes the scientific method - Answers a systematic process used to
find a solution to a problem
The ability to produce change is known as - Answers Energy
A physical quantity that remains constant during an experiment is known as a - Answers Control
Where an increase in the independent variable causes the dependent variable to increase -
Answers Direct proportion
Which of the following best describes a model - Answers A simple representation of a complex
concept of nature
Which of the following is a measurement of time - Answers The second
Which of the following is a measurement of the amount of a substance - Answers The mole
Which of the refers to the agreement of several measurements among each other - Answers
Precise
How many significant figures are in 75,021,000 m - Answers 5
How many significant figures are in 0.00301 m - Answers 3
How many significant figures are in 2.030x10^4 kg - Answers 4
Classical physics is an excellent approximation as long as three things are true. Which of the
following statements is one of those three things? - Answers The objects dealt with must be
large enough to be seen one of the microscope
Besides factors that are unique to the situation, the factors contributing to uncertainty in a
measurement include: - Answers Limitations of the measuring device and the skill of the person
making the measurement.
The mass of a block of wood is reported as 458 +- 21 g. What is the percent uncertainty? -
Answers (21g/458) × 100= 4.58 = 4.6%
The time for a drag race is 17.5 s ‡ 8.1%. What is the absolute uncertainty? - Answers 17.5 s X
8.1% = 1.4175 → 1.4 s
Covert 50 km to meters. - Answers 50km x(1m/1000km) = 0.05m
Covert 7200 mg to grams. - Answers 7200mg x (1g/1000mg)= 7.2g
,A person runs a race in 2712 s. How many minutes is this time? - Answers 2712s x (1min/60s)=
45.20minutes
What do you get when you divide 42.0 m by 15.0 s? - Answers 42.0m/ 15.0s= 2.8
2.80 m/s
In a meaningful paragraph or two, describe the role of experimentation in science. Be sure to
describe how experimental data can affect our knowledge of the universe and how the reliability
of information is affected by the presence or lack of experimental data. - Answers
Experimentation in sicence is important because it helps us learn about how things work in the
world.
By running experiments, scientist can collect evidence that shows weather their ideas are
correct or need to be changed. this evidence helps us understand the universe better and makes
our ideas more reliable. When their is a good experimental data, we can trust the information
more because it is based on real observations. If there was no experimental data taking place
then the ideas would just be guesses and could possibly not be true. So experiments help us
find the truth behind things and make scientific knowledge stronger and more trustworthy.
In an experiment, the factors that affect the period of oscillation of a mass bouncing on a spring
are being tested. During one set of trials, the mass of the object attached to the spring is
systematically increased, and the resulting period of the system is measured. The entire time
the same spring is used.
Identify the independent variable, the dependent variable, and the controlled variable. - Answers
independent variable: mass of the object attached to the spring dependent variable: period of
the system
controlled variable: the spring used during the experiment
You sit down at your desk to start your homework online and attempt to turn on your computer.
Unfortunately, it will not turn on. Despite being enraged, you decide to calm down and to use the
6 steps of the scientific method by Karl Pearson to find out why your computer will not turn on.
Describe the steps of the scientific method and what specifc actions would you take during
each step of the scientific method. - Answers 1. find the problem
computer will not turn on
2. Gather data
look around the room and desk to see what could have happened (I see a sippy cup of water
spilled on the floor with the lid missing)
3. form a hypothesis
, I believe that my little brother spilled his cup of water on my computer
4. expand Hypothesis
i believe that when my brother was in my room watching youtube on my computer he spilled his
water on my computer
5. Test Hypothesis
I tested my hypothesis by looking through the house. I see my older brother eating at the table,
my dog napping and I see my brother on the couch crying with a wet shirt.
6. Evaluate Hypothesis
My hypothesis was correct my brothers shirt was wet from when he spilled his cup on my
computer while he was watching youtube and he was crying because he was scared to tell me.
Exam 2 - Answers
Which of the following of the best definition of reference frame - Answers A collection of
objects that are considered to be stationary that is used to describe the motion of objects
A physical quantity that has only magnitude is known as a - Answers Scalar
Classify displacement as a vector quantity for a scalar quantity - Answers Vector
The rate of change in velocity is known as _____ it is usually measured in meters per second
squared (m/s2) - Answers Acceleration
Hey, Rob, dropped off of a cliff is in freefall during its motion to the bottom of the cliff which of
the following statements is true about the rocks motion - Answers The speed of the rock
increases as it falls, the celebration of the rock is constant as it falls, gravity is the only force
acting on the rock
A ball is to vertically upward with the speed of 10.0 M/S which of the following is true about the
balls of motion at the peak of its path - Answers The ball has zero speed
A ball is tall vertically upwards with a speed of 20.0 M/S when it is called at the same height
which it was thrown it will have a downward speed of about - Answers 20.0 M/S
What is the celebration due to gravity of an object in freefall rounded to the hundreds place in
M/S^2 - Answers 9.8
True or false the motion of two balls is being analyzed. They are both set in motion at the same
time and from the same height the red ball is dropped in the green ball is launched horizontally.
Air resistance is negligible . Both balls will hit the ground at the same time. - Answers True
A security guard walks around the perimeter of a building during one of his rounds the distance
Exam 1 - Answers
Which statement best describes the scientific method - Answers a systematic process used to
find a solution to a problem
The ability to produce change is known as - Answers Energy
A physical quantity that remains constant during an experiment is known as a - Answers Control
Where an increase in the independent variable causes the dependent variable to increase -
Answers Direct proportion
Which of the following best describes a model - Answers A simple representation of a complex
concept of nature
Which of the following is a measurement of time - Answers The second
Which of the following is a measurement of the amount of a substance - Answers The mole
Which of the refers to the agreement of several measurements among each other - Answers
Precise
How many significant figures are in 75,021,000 m - Answers 5
How many significant figures are in 0.00301 m - Answers 3
How many significant figures are in 2.030x10^4 kg - Answers 4
Classical physics is an excellent approximation as long as three things are true. Which of the
following statements is one of those three things? - Answers The objects dealt with must be
large enough to be seen one of the microscope
Besides factors that are unique to the situation, the factors contributing to uncertainty in a
measurement include: - Answers Limitations of the measuring device and the skill of the person
making the measurement.
The mass of a block of wood is reported as 458 +- 21 g. What is the percent uncertainty? -
Answers (21g/458) × 100= 4.58 = 4.6%
The time for a drag race is 17.5 s ‡ 8.1%. What is the absolute uncertainty? - Answers 17.5 s X
8.1% = 1.4175 → 1.4 s
Covert 50 km to meters. - Answers 50km x(1m/1000km) = 0.05m
Covert 7200 mg to grams. - Answers 7200mg x (1g/1000mg)= 7.2g
,A person runs a race in 2712 s. How many minutes is this time? - Answers 2712s x (1min/60s)=
45.20minutes
What do you get when you divide 42.0 m by 15.0 s? - Answers 42.0m/ 15.0s= 2.8
2.80 m/s
In a meaningful paragraph or two, describe the role of experimentation in science. Be sure to
describe how experimental data can affect our knowledge of the universe and how the reliability
of information is affected by the presence or lack of experimental data. - Answers
Experimentation in sicence is important because it helps us learn about how things work in the
world.
By running experiments, scientist can collect evidence that shows weather their ideas are
correct or need to be changed. this evidence helps us understand the universe better and makes
our ideas more reliable. When their is a good experimental data, we can trust the information
more because it is based on real observations. If there was no experimental data taking place
then the ideas would just be guesses and could possibly not be true. So experiments help us
find the truth behind things and make scientific knowledge stronger and more trustworthy.
In an experiment, the factors that affect the period of oscillation of a mass bouncing on a spring
are being tested. During one set of trials, the mass of the object attached to the spring is
systematically increased, and the resulting period of the system is measured. The entire time
the same spring is used.
Identify the independent variable, the dependent variable, and the controlled variable. - Answers
independent variable: mass of the object attached to the spring dependent variable: period of
the system
controlled variable: the spring used during the experiment
You sit down at your desk to start your homework online and attempt to turn on your computer.
Unfortunately, it will not turn on. Despite being enraged, you decide to calm down and to use the
6 steps of the scientific method by Karl Pearson to find out why your computer will not turn on.
Describe the steps of the scientific method and what specifc actions would you take during
each step of the scientific method. - Answers 1. find the problem
computer will not turn on
2. Gather data
look around the room and desk to see what could have happened (I see a sippy cup of water
spilled on the floor with the lid missing)
3. form a hypothesis
, I believe that my little brother spilled his cup of water on my computer
4. expand Hypothesis
i believe that when my brother was in my room watching youtube on my computer he spilled his
water on my computer
5. Test Hypothesis
I tested my hypothesis by looking through the house. I see my older brother eating at the table,
my dog napping and I see my brother on the couch crying with a wet shirt.
6. Evaluate Hypothesis
My hypothesis was correct my brothers shirt was wet from when he spilled his cup on my
computer while he was watching youtube and he was crying because he was scared to tell me.
Exam 2 - Answers
Which of the following of the best definition of reference frame - Answers A collection of
objects that are considered to be stationary that is used to describe the motion of objects
A physical quantity that has only magnitude is known as a - Answers Scalar
Classify displacement as a vector quantity for a scalar quantity - Answers Vector
The rate of change in velocity is known as _____ it is usually measured in meters per second
squared (m/s2) - Answers Acceleration
Hey, Rob, dropped off of a cliff is in freefall during its motion to the bottom of the cliff which of
the following statements is true about the rocks motion - Answers The speed of the rock
increases as it falls, the celebration of the rock is constant as it falls, gravity is the only force
acting on the rock
A ball is to vertically upward with the speed of 10.0 M/S which of the following is true about the
balls of motion at the peak of its path - Answers The ball has zero speed
A ball is tall vertically upwards with a speed of 20.0 M/S when it is called at the same height
which it was thrown it will have a downward speed of about - Answers 20.0 M/S
What is the celebration due to gravity of an object in freefall rounded to the hundreds place in
M/S^2 - Answers 9.8
True or false the motion of two balls is being analyzed. They are both set in motion at the same
time and from the same height the red ball is dropped in the green ball is launched horizontally.
Air resistance is negligible . Both balls will hit the ground at the same time. - Answers True
A security guard walks around the perimeter of a building during one of his rounds the distance
