For a fluid, the assumption (simplifying notion) of incompressibility has important consequences: Pascal’s principle: a change of pressure in an enclosed fluid at rest is transmitted undiminished to all points in the fluid. pressure changes are transmitted immediately from one place to another. the speed of sound then is infinite (just within this approximation). pressure becomes unpredictable. none of the above.
For a fluid, the assumption (simplifying notion) of incompressibility has important consequences: Pascal’s principle: a change of pressure in an enclosed fluid at rest is transmitted undiminished to all points in the fluid. pressure changes are transmitted immediately from one place to another. the speed of sound then is infinite (just within this approximation). pressure becomes unpredictable. none of the above.
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter5: Analysis Of Convection Heat Transfer
Section: Chapter Questions
Problem 5.9P: When a sphere falls freely through a homogeneous fluid, it reaches a terminal velocity at which the...
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In the following section, at least 2 to up to 5 answers may be correct.
1) For a fluid, the assumption (simplifying notion) of incompressibility has important consequences:
Pascal’s principle: a change of pressure in an enclosed fluid at rest is transmitted undiminished to all points in the fluid.
pressure changes are transmitted immediately from one place to another.
the speed of sound then is infinite (just within this approximation).
pressure becomes unpredictable.
none of the above.
2)
Archimedes’ principle can be summarized as:
an immersed object is buoyed up by a force equal to the weight of the fluid it displaces.
a bathtub is fun, and may lead to important physical discoveries regarding the volume of an object and how much water it displaces, and the weight of that amount of water.
boats swim because of the work done by sailors.
submarines are always doomed.
fish swim because they are less heavy than water
3) A plasma is different from a regular gas, in that it ...
can carry a current
has no pressure.
has no temperature.
contains charged particles.
4) The Kelvin temperature scale ...
is different by about 273 “degrees” from the Celsius scale.
has an absolute zero when all thermal motion (of atoms and molecules) stops (exception: quantum-mechanical ground state motion)..
is the same as degrees Celsius.
has the same intervals as degrees Celsius.
has the same zero “degrees” as Celsius.
5) Matter can exist in these different states (“phases”):
solid
gasliquid
fire
plasma
6) The following is true about condensation in the atmosphere:
when an air mass warms up, its relative humidity decreases.
when warm, very moist air cools down, eventually fog or rain will form.
when cold, moist air cools down even further, ice crystals (snow) may form.
warm air can hold more water (vapor) than cold air.
we measure relative humidity as a percentage of how much water air could hold in principle, at a given temperature.
7) In thermodynamics , the following properties (of a gas) might change:
work being done on it or by it.
its volume.
the number of neutrons.
its temperature.
heat being added or withdrawn.
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