Rio Salado PHY 111 Final Questions with Complete
Solutions 2025 graded A+
Mechanical energy is not valid in which of the following cases? - Answer- A block sliding
down a rough inclined plane
If the force on an object is doubled, which of the following statements is correct? - Answer-
Acceleration is increased by two times.
What is the most accurate statement concerning work? - Answer- Work on a system causes a
change in the energy of the system.
What is the most accurate statement concerning momentum? - Answer- Like other vector
quantities, momentum can be resolved into perpendicular components.
What is the most accurate statement concerning gravitational potential energy? - Answer-
The gravitational potential energy (PE) is the energy an object has due to its position in a
gravitational field.
What is the most accurate statement concerning momentum and impulse? - Answer- The net
force on an object is equal to the change in momentum of the object wrt time.
What is the most accurate statement concerning angular displacement? - Answer- Angular
displacement must be expressed in radians for rotational kinematic equations.
What is the most accurate statement concerning angular momentum? - Answer- Angular
momentum is the product of moment of inertia and angular velocity.
What is the most accurate statement concerning rotational work? - Answer- Rotational work
on a system causes a change in the energy of the system.
,What is the most accurate statement concerning angular velocity? - Answer- Angular
velocity, omega, is the change in angular displacement divided by the time interval over
which that change occurred.
What is the most accurate statement concerning torque? - Answer- Torque is a vector cross
product, r x F.
A horizontal beam is supported horizontally. It is attached to the wall by a small hinge. The
force that the hinge exerts ON THE BEAM has components - Answer- downward and to the
left.
A person pushes vertically downward with force P on a lever of length L that is inclined at
angle θ above the horizontal. What is the torque produced by the force P about the pivot
point? - Answer- PL cos θ
A weight W swings from a hook in the ceiling by a light string of length L. T is the tension in
the string. When the string makes an angle θ with the vertical, what is the net torque about
the hook? - Answer- WL sin θ
A heavy solid disk rotating freely and slowed down by only by friction applied at its outer
edge takes 100 s to come to a stop. If the disk had twice the radius and twice the mass, but
the frictional force remained the same, what is the time for the disk to come to rest from the
same initial rotational speed? - Answer- 400 s
A student is sitting on a frictionless rotating stool with her arms outstretched holding equal
heavy weights in each hand. If she suddenly lets go of the weights, her angular speed will -
Answer- Remain the same
If the torques on an object balance, then it follows that this object - Answer- cannot have
any angular momentum.
,Two points are on a disk that rotates about an axis perpendicular to the plane of the disk at
its center. Point B is 3 times as far from the axis as Point A. If the linear speed of point B is v ,
then the linear speed of point A is - Answer- v/3.
You are designing a flywheel to store large amounts of kinetic energy. Which of the following
uniform shapes will be the most effective for storing the greatest amount of kinetic energy if
all the objects have the same mass and same angular velocity? - Answer- A thin walled
hollow cylinder of diameter D rotating about an axis perpendicular to the plane of the
circular face of its center
Four uniform objects having the same mass and diameter are released simultaneously from
rest at the same distance above the bottom of a hill and roll down without slipping. The
objects are a solid sphere, a solid cylinder, a hollow cylinder, and a thin-walled hollow
cylinder. Which of these objects will be the first one to reach the bottom of the hill? -
Answer- The solid sphere
Four uniform objects having the same mass and diameter are released simultaneously from
rest at the same distance above the bottom of a hill and roll down without slipping. The
objects are a solid sphere, a solid cylinder, a hollow cylinder and a thin-walled hollow
cylinder. Which of these objects will be the last one to reach the bottom of the hill? - Answer-
The thin-walled hollow cylinder
What is the most accurate statement concerning the elastic modulus? - Answer- Elastic
modulus is a constant of proportionality that relates stress to strain.
What is the most accurate statement concerning simple harmonic motion (SHM)? - Answer-
SHM describes the vibrational motion of an object oscillating back and forth through an
equilibrium position.
What is the most accurate statement concerning an object undergoing simple harmonic
motion (SHM)? - Answer- The object's velocity is maximum as it passes the equilibrium
position.
, What is the most accurate statement concerning sound waves? - Answer- Sound waves are
longitudinal waves whose wave speed depends on the transmitting medium.
What is the most accurate statement concerning the physical pendulum? - Answer- The
period for one complete oscillation is directly proportional to the square root of the length of
the pendulum.
Which of the following is an accurate statement? - Answer- The sound in an organ pipe can
vibrate at an infinite number of frequencies.
Which of the following increases when a sound becomes louder? - Answer- Amplitude
A simple pendulum has a period T on the Earth. If it were used on Planet X, where the
acceleration due to gravity is 3 times what it is on Earth, its period would be which of the
following? - Answer- T√ (1/3)
For an object undergoing simple harmonic motion, - Answer- the acceleration is greatest
when the displacement is greatest.
Which of the following can be used as a measure of an object's inertia?
mass, force, velocity, acceleration
acceleration
Inertia is the measure of...
a push or pull on an object
the difficulty of changing an object's motion
a velocity of an object
none of the above
the difficulty of changing an object's motion
in order for an object to experience a change in velocity, the object must experience which of
the following?
Solutions 2025 graded A+
Mechanical energy is not valid in which of the following cases? - Answer- A block sliding
down a rough inclined plane
If the force on an object is doubled, which of the following statements is correct? - Answer-
Acceleration is increased by two times.
What is the most accurate statement concerning work? - Answer- Work on a system causes a
change in the energy of the system.
What is the most accurate statement concerning momentum? - Answer- Like other vector
quantities, momentum can be resolved into perpendicular components.
What is the most accurate statement concerning gravitational potential energy? - Answer-
The gravitational potential energy (PE) is the energy an object has due to its position in a
gravitational field.
What is the most accurate statement concerning momentum and impulse? - Answer- The net
force on an object is equal to the change in momentum of the object wrt time.
What is the most accurate statement concerning angular displacement? - Answer- Angular
displacement must be expressed in radians for rotational kinematic equations.
What is the most accurate statement concerning angular momentum? - Answer- Angular
momentum is the product of moment of inertia and angular velocity.
What is the most accurate statement concerning rotational work? - Answer- Rotational work
on a system causes a change in the energy of the system.
,What is the most accurate statement concerning angular velocity? - Answer- Angular
velocity, omega, is the change in angular displacement divided by the time interval over
which that change occurred.
What is the most accurate statement concerning torque? - Answer- Torque is a vector cross
product, r x F.
A horizontal beam is supported horizontally. It is attached to the wall by a small hinge. The
force that the hinge exerts ON THE BEAM has components - Answer- downward and to the
left.
A person pushes vertically downward with force P on a lever of length L that is inclined at
angle θ above the horizontal. What is the torque produced by the force P about the pivot
point? - Answer- PL cos θ
A weight W swings from a hook in the ceiling by a light string of length L. T is the tension in
the string. When the string makes an angle θ with the vertical, what is the net torque about
the hook? - Answer- WL sin θ
A heavy solid disk rotating freely and slowed down by only by friction applied at its outer
edge takes 100 s to come to a stop. If the disk had twice the radius and twice the mass, but
the frictional force remained the same, what is the time for the disk to come to rest from the
same initial rotational speed? - Answer- 400 s
A student is sitting on a frictionless rotating stool with her arms outstretched holding equal
heavy weights in each hand. If she suddenly lets go of the weights, her angular speed will -
Answer- Remain the same
If the torques on an object balance, then it follows that this object - Answer- cannot have
any angular momentum.
,Two points are on a disk that rotates about an axis perpendicular to the plane of the disk at
its center. Point B is 3 times as far from the axis as Point A. If the linear speed of point B is v ,
then the linear speed of point A is - Answer- v/3.
You are designing a flywheel to store large amounts of kinetic energy. Which of the following
uniform shapes will be the most effective for storing the greatest amount of kinetic energy if
all the objects have the same mass and same angular velocity? - Answer- A thin walled
hollow cylinder of diameter D rotating about an axis perpendicular to the plane of the
circular face of its center
Four uniform objects having the same mass and diameter are released simultaneously from
rest at the same distance above the bottom of a hill and roll down without slipping. The
objects are a solid sphere, a solid cylinder, a hollow cylinder, and a thin-walled hollow
cylinder. Which of these objects will be the first one to reach the bottom of the hill? -
Answer- The solid sphere
Four uniform objects having the same mass and diameter are released simultaneously from
rest at the same distance above the bottom of a hill and roll down without slipping. The
objects are a solid sphere, a solid cylinder, a hollow cylinder and a thin-walled hollow
cylinder. Which of these objects will be the last one to reach the bottom of the hill? - Answer-
The thin-walled hollow cylinder
What is the most accurate statement concerning the elastic modulus? - Answer- Elastic
modulus is a constant of proportionality that relates stress to strain.
What is the most accurate statement concerning simple harmonic motion (SHM)? - Answer-
SHM describes the vibrational motion of an object oscillating back and forth through an
equilibrium position.
What is the most accurate statement concerning an object undergoing simple harmonic
motion (SHM)? - Answer- The object's velocity is maximum as it passes the equilibrium
position.
, What is the most accurate statement concerning sound waves? - Answer- Sound waves are
longitudinal waves whose wave speed depends on the transmitting medium.
What is the most accurate statement concerning the physical pendulum? - Answer- The
period for one complete oscillation is directly proportional to the square root of the length of
the pendulum.
Which of the following is an accurate statement? - Answer- The sound in an organ pipe can
vibrate at an infinite number of frequencies.
Which of the following increases when a sound becomes louder? - Answer- Amplitude
A simple pendulum has a period T on the Earth. If it were used on Planet X, where the
acceleration due to gravity is 3 times what it is on Earth, its period would be which of the
following? - Answer- T√ (1/3)
For an object undergoing simple harmonic motion, - Answer- the acceleration is greatest
when the displacement is greatest.
Which of the following can be used as a measure of an object's inertia?
mass, force, velocity, acceleration
acceleration
Inertia is the measure of...
a push or pull on an object
the difficulty of changing an object's motion
a velocity of an object
none of the above
the difficulty of changing an object's motion
in order for an object to experience a change in velocity, the object must experience which of
the following?
