Physical science gerner Questions
What happens to the volume of a loaf of bread when it is squeezed? What happens to the mass? To
the density? - verified answer Volume decreases masterminds and changed and density increases
when the loaf is squeezed.
Distinguish between for some pressure. Compare their units of measurement. - verified answer
Force is a push or pull measured in newtons; pressures force per unit area measured in newtons per
square meter
How does the pressure exerted by a liquid change with a liquid how does the pressure exerted by a
liquid changes the density of a liquid changes? - verified answer According to the formula, liquid
pressure = density × depth, pressure increases with an increase in depth and/or an increase in
density.
How does water pressure 1m below the surface of a small pond compare to water pressure 1m
below the surface of a huge lake? - verified answer Pressure at the same depth will be the same in
the pond or the lake
what does buoyant force act upward on an object submerged in water? - verified answer Buoyant
force acts upward because pressure is greater up against the bottom where the water is deeper
state Archimedes principle - verified answer An immersed body is buoyed up by a force equal to the
weight of the fluid displaced.
does the buoyant force on a floating object depend on the weight of the object or on the weight of
the fluid displaced by the object? Or are these two weights the same for the special case of floating?
Defend your answer. - verified answer In the special case of floating, both buoyant force and the
weight of the floating object are the same. In all cases, buoyant force equals the weight of fluid
displaced.
what weight of water is displaced by a 100-ton floating ship? What is the buoyant force that acts on
this ship? - verified answer 100 tons of water are displaced by a 100-ton floating ship. Buoyant force
on the ship is therefore 100 tons.
how does the weight of mercury in a barometer tube compare with the weight of an equal cross-
section of air from sea level to the top of the atmosphere? - verified answer Both weights are the
same.
, what happens to the pressure in all parts of a confined fluid when the pressure in one part is
increased? - verified answer An increase in pressure in one part of a confined fluid is transmitted
throughout the fluid to all parts
does pascals principle provide a way to get more energy from a machine that is put into it? - verified
answer No! No machine can do that. Pascal's principle provides a way to multiply force (at the
expense of distance).
a balloon that weighs 1 N is suspended in air, drifting neither up nor down. How much buoyant force
acts on it? What happens f the buoyant force decreases? Increases? - verified answer When the
balloon is in equilibrium, buoyant force equals its weight, 1 N. If the buoyant force increases, the
balloon will rise.
Does Bernoullis principle refer to internal pressure change in a fluid, or to pressures that a fluid can
exert on objects in the path of the flowing fluid? Or both? - verified answer Bernoulli's principle
refers only to the internal pressure changes in a fluid; not to pressures the fluid may exert when it
interacts with objects in the path of the fluid
What do peaked roofs, convertible tops and airplane wings have in common when air moves fastest
across their top surface? - verified answer When air speeds up in passing over these surfaces,
streamlines become more crowded and air pressure at the surfaces decreases. All three experience
a "lift."
Rank the following from highest to lowest percentage of its volume above the waterline: (a)
basketball floating in fresh water, (b) basketball floating in salt water, and (c) basketball floating in
mercury. - verified answer C, B, A.
Rank the buoyant force supplied by the atmosphere on the following, from greatest to least (a) an
elephant, (b) a helium-filled party balloon and (c) a skydiver at terminal velocity. - verified answer A,
C, B
You know that a sharp knife cuts better than a dull knife. Do you know why this is so? Defend your
answer. - verified answer A sharp knife cuts better than a dull knife because it has a thinner cutting
area which results in more cutting pressure for a given force
What happens to the volume of a loaf of bread when it is squeezed? What happens to the mass? To
the density? - verified answer Volume decreases masterminds and changed and density increases
when the loaf is squeezed.
Distinguish between for some pressure. Compare their units of measurement. - verified answer
Force is a push or pull measured in newtons; pressures force per unit area measured in newtons per
square meter
How does the pressure exerted by a liquid change with a liquid how does the pressure exerted by a
liquid changes the density of a liquid changes? - verified answer According to the formula, liquid
pressure = density × depth, pressure increases with an increase in depth and/or an increase in
density.
How does water pressure 1m below the surface of a small pond compare to water pressure 1m
below the surface of a huge lake? - verified answer Pressure at the same depth will be the same in
the pond or the lake
what does buoyant force act upward on an object submerged in water? - verified answer Buoyant
force acts upward because pressure is greater up against the bottom where the water is deeper
state Archimedes principle - verified answer An immersed body is buoyed up by a force equal to the
weight of the fluid displaced.
does the buoyant force on a floating object depend on the weight of the object or on the weight of
the fluid displaced by the object? Or are these two weights the same for the special case of floating?
Defend your answer. - verified answer In the special case of floating, both buoyant force and the
weight of the floating object are the same. In all cases, buoyant force equals the weight of fluid
displaced.
what weight of water is displaced by a 100-ton floating ship? What is the buoyant force that acts on
this ship? - verified answer 100 tons of water are displaced by a 100-ton floating ship. Buoyant force
on the ship is therefore 100 tons.
how does the weight of mercury in a barometer tube compare with the weight of an equal cross-
section of air from sea level to the top of the atmosphere? - verified answer Both weights are the
same.
, what happens to the pressure in all parts of a confined fluid when the pressure in one part is
increased? - verified answer An increase in pressure in one part of a confined fluid is transmitted
throughout the fluid to all parts
does pascals principle provide a way to get more energy from a machine that is put into it? - verified
answer No! No machine can do that. Pascal's principle provides a way to multiply force (at the
expense of distance).
a balloon that weighs 1 N is suspended in air, drifting neither up nor down. How much buoyant force
acts on it? What happens f the buoyant force decreases? Increases? - verified answer When the
balloon is in equilibrium, buoyant force equals its weight, 1 N. If the buoyant force increases, the
balloon will rise.
Does Bernoullis principle refer to internal pressure change in a fluid, or to pressures that a fluid can
exert on objects in the path of the flowing fluid? Or both? - verified answer Bernoulli's principle
refers only to the internal pressure changes in a fluid; not to pressures the fluid may exert when it
interacts with objects in the path of the fluid
What do peaked roofs, convertible tops and airplane wings have in common when air moves fastest
across their top surface? - verified answer When air speeds up in passing over these surfaces,
streamlines become more crowded and air pressure at the surfaces decreases. All three experience
a "lift."
Rank the following from highest to lowest percentage of its volume above the waterline: (a)
basketball floating in fresh water, (b) basketball floating in salt water, and (c) basketball floating in
mercury. - verified answer C, B, A.
Rank the buoyant force supplied by the atmosphere on the following, from greatest to least (a) an
elephant, (b) a helium-filled party balloon and (c) a skydiver at terminal velocity. - verified answer A,
C, B
You know that a sharp knife cuts better than a dull knife. Do you know why this is so? Defend your
answer. - verified answer A sharp knife cuts better than a dull knife because it has a thinner cutting
area which results in more cutting pressure for a given force
