Physics 121 - Exam 3 Questions and
answers verified to pass 2025
rotational kinetic energy - correct answer ✔objects have this if they are
rotating as well as experiencing translational motion
total kinetic energy - correct answer ✔work done by non-conservative forces
(not including friction/air)
torque - correct answer ✔the rotational analog to force; does work and
power
newton's 2nd law, rotationally - correct answer ✔sum of the torques =
moment of inertia X acceleration
rolling objects - correct answer ✔objects that have both translational motion
and rotational motion
fluids - correct answer ✔materials that flow (liquids and gases);
incompressible
static fluid - correct answer ✔fluid that does not flow, but its individual
particles are constantly moving
pressure - correct answer ✔this is caused by those constant, fast collisions
with objects in the fluid
Brownian motion - correct answer ✔illustrates the random, high-speed
collisions in a fluid
, atmospheric pressure - correct answer ✔= 1 atm
Pascal's principle - correct answer ✔a change in pressure at any point in a
confined fluid is transmitted everywhere throughout the fluid
density - correct answer ✔this is a substance's mass pper unit volume
density of pure water - correct answer ✔= 1000 kg/m^3 or 1 g/cm^3
mercury manometer - correct answer ✔object that looks like a U-shaped
tube and is used to figure out the pressure of a mystery gas
1 mmHg - correct answer ✔= 133 Pa
1 atm - correct answer ✔= 101.3 kPa
barometer - correct answer ✔a device used to measure atmospheric
pressure; mercury is used in it because it is the most sensitive fluid to
pressure changes
buoyant force - correct answer ✔the sum of the forces due to fluid pressure
Archimedes' principle - correct answer ✔a fluid exerts an upward buoyant
force on a submerged object equal in magnitude to the weight of the volume
of fluid displaced by the object
answers verified to pass 2025
rotational kinetic energy - correct answer ✔objects have this if they are
rotating as well as experiencing translational motion
total kinetic energy - correct answer ✔work done by non-conservative forces
(not including friction/air)
torque - correct answer ✔the rotational analog to force; does work and
power
newton's 2nd law, rotationally - correct answer ✔sum of the torques =
moment of inertia X acceleration
rolling objects - correct answer ✔objects that have both translational motion
and rotational motion
fluids - correct answer ✔materials that flow (liquids and gases);
incompressible
static fluid - correct answer ✔fluid that does not flow, but its individual
particles are constantly moving
pressure - correct answer ✔this is caused by those constant, fast collisions
with objects in the fluid
Brownian motion - correct answer ✔illustrates the random, high-speed
collisions in a fluid
, atmospheric pressure - correct answer ✔= 1 atm
Pascal's principle - correct answer ✔a change in pressure at any point in a
confined fluid is transmitted everywhere throughout the fluid
density - correct answer ✔this is a substance's mass pper unit volume
density of pure water - correct answer ✔= 1000 kg/m^3 or 1 g/cm^3
mercury manometer - correct answer ✔object that looks like a U-shaped
tube and is used to figure out the pressure of a mystery gas
1 mmHg - correct answer ✔= 133 Pa
1 atm - correct answer ✔= 101.3 kPa
barometer - correct answer ✔a device used to measure atmospheric
pressure; mercury is used in it because it is the most sensitive fluid to
pressure changes
buoyant force - correct answer ✔the sum of the forces due to fluid pressure
Archimedes' principle - correct answer ✔a fluid exerts an upward buoyant
force on a submerged object equal in magnitude to the weight of the volume
of fluid displaced by the object
