AC HPAT Physics Exam Solved 100% Correct
Density - ANSWERS-· Density is a measure of mass per volume. The average density of an object
equals its total mass divided by its total volume. An object made from a comparatively dense
material (such as iron) will have less volume than an object of equal mass made from some less
dense substance (such as water).
Atmospheric pressure - ANSWERS-· Atmospheric pressure is a force in an area pushed against a
surface by the weight of the atmosphere of Earth, a layer of air. ... This is because high places do
not have as much air above them, pushing down. Barometers can be used to measure
atmospheric pressure. There is the same atmospheric pressure from all directions.
Absolute Pressure - ANSWERS-· Absolute pressure is a pressure that is relative to the zero
pressure in the empty, air-free space of the universe. This reference pressure is the ideal or
absolute vacuum. It is denoted with the subscript "abs": Pabs.
Laminar flow - ANSWERS-· Laminar flow is a flow regime characterized by high momentum
diffusion and low momentum convection. When a fluid is flowing through a closed channel such
as a pipe or between two flat plates, either of two types of flow may occur depending on the
velocity and viscosity of the fluid: laminar flow or turbulent flow.
Static pressure - ANSWERS-· Static pressure is one of the most important factors in HVAC design.
Simply put, static pressure refers to the resistance to airflow in a heating and cooling system's
components and duct work. The push of the air must be greater than the resistance to the flow
or no air will circulate through the ducts
Boyles Law - ANSWERS-· Boyle's law is a gas law, stating that the pressure and volume of a gas
have an inverse relationship. If volume increases, then pressure decreases and vice versa, when
temperature is held constant.
, Volumetric flow rate - ANSWERS-· the volumetric flow rate (also known as volume flow rate,
rate of fluid flow or volume velocity) is the volume of fluid which passes per unit time; usually
represented by the symbol Q (sometimes V̇ ). The SI unit is cubic metres per second (m3/s).
Pascals Law - ANSWERS-· Pascal's law basically states that any pressure applied to a fluid inside a
closed system will transmit that pressure equally in all directions throughout the fluid. This law
is the basic principle that causes hydraulic power in heavy construction machines to work.
Bernoulli's Principle - ANSWERS-· Bernoulli's principle is an idea of fluid dynamics. It says that as
speed of the fluid increases, pressure decreases. For a steady flow, the amount of fluid entering
the pipe must equal the amount leaving the pipe, so the fluid speed in the thin part must
increase.
DIstance - ANSWERS-· Distance is a scalar quantity that refers to "how much ground an object
has covered" during its motion.
Displacement - ANSWERS-· Displacement is a vector quantity that refers to "how far out of place
an object is"; it is the object's overall change in position.
Position - ANSWERS-· Position is a place where someone or something is located or has been
put. In physics, position is usually a number on an axis. ... Position is a vector, because direction
matters. But distance is a scalar. Distance is how far you've traveled.
Speed - ANSWERS-· Speed is the distance traveled per unit of time. It is how fast an object is
moving. Speed is the scalar quantity that is the magnitude of the velocity vector. It doesn't have
a direction.
Acceleration - ANSWERS-· Acceleration is the rate of change of velocity with time.
Density - ANSWERS-· Density is a measure of mass per volume. The average density of an object
equals its total mass divided by its total volume. An object made from a comparatively dense
material (such as iron) will have less volume than an object of equal mass made from some less
dense substance (such as water).
Atmospheric pressure - ANSWERS-· Atmospheric pressure is a force in an area pushed against a
surface by the weight of the atmosphere of Earth, a layer of air. ... This is because high places do
not have as much air above them, pushing down. Barometers can be used to measure
atmospheric pressure. There is the same atmospheric pressure from all directions.
Absolute Pressure - ANSWERS-· Absolute pressure is a pressure that is relative to the zero
pressure in the empty, air-free space of the universe. This reference pressure is the ideal or
absolute vacuum. It is denoted with the subscript "abs": Pabs.
Laminar flow - ANSWERS-· Laminar flow is a flow regime characterized by high momentum
diffusion and low momentum convection. When a fluid is flowing through a closed channel such
as a pipe or between two flat plates, either of two types of flow may occur depending on the
velocity and viscosity of the fluid: laminar flow or turbulent flow.
Static pressure - ANSWERS-· Static pressure is one of the most important factors in HVAC design.
Simply put, static pressure refers to the resistance to airflow in a heating and cooling system's
components and duct work. The push of the air must be greater than the resistance to the flow
or no air will circulate through the ducts
Boyles Law - ANSWERS-· Boyle's law is a gas law, stating that the pressure and volume of a gas
have an inverse relationship. If volume increases, then pressure decreases and vice versa, when
temperature is held constant.
, Volumetric flow rate - ANSWERS-· the volumetric flow rate (also known as volume flow rate,
rate of fluid flow or volume velocity) is the volume of fluid which passes per unit time; usually
represented by the symbol Q (sometimes V̇ ). The SI unit is cubic metres per second (m3/s).
Pascals Law - ANSWERS-· Pascal's law basically states that any pressure applied to a fluid inside a
closed system will transmit that pressure equally in all directions throughout the fluid. This law
is the basic principle that causes hydraulic power in heavy construction machines to work.
Bernoulli's Principle - ANSWERS-· Bernoulli's principle is an idea of fluid dynamics. It says that as
speed of the fluid increases, pressure decreases. For a steady flow, the amount of fluid entering
the pipe must equal the amount leaving the pipe, so the fluid speed in the thin part must
increase.
DIstance - ANSWERS-· Distance is a scalar quantity that refers to "how much ground an object
has covered" during its motion.
Displacement - ANSWERS-· Displacement is a vector quantity that refers to "how far out of place
an object is"; it is the object's overall change in position.
Position - ANSWERS-· Position is a place where someone or something is located or has been
put. In physics, position is usually a number on an axis. ... Position is a vector, because direction
matters. But distance is a scalar. Distance is how far you've traveled.
Speed - ANSWERS-· Speed is the distance traveled per unit of time. It is how fast an object is
moving. Speed is the scalar quantity that is the magnitude of the velocity vector. It doesn't have
a direction.
Acceleration - ANSWERS-· Acceleration is the rate of change of velocity with time.
