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IF U R A SCIENCE STUDENT ANSWER THIS QUESTIONS 4 ME
IF U R A SCIENCE STUDENT ANSWER THIS QUESTIONS 4 ME
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LIQUID STAR1000
explain y d efficiency of a machine is always less than 100%?
tyoakula
Onyii Glad
Because some of the works done is used to overcome friction.whats my reward liquidstar1000
idigunjoseph
physiology
Mr Paul
Mod.
The mechanical efficiency of a machine is always less than 100% because some energy is lost as heat in friction.
EXPLANATIONS:
In simple machine, efficiency is defined as Mechanical Advantage divided by Velocity Ratio (Efficiency= MA/VR ).
Gasoline Engine may have a thermal efficiency of only 25% and steam engine may have just 10%.
When the machine is a heat engine, the theoretical thermal efficiency can be found from the 2nd law of thermodynamics, but the values are always lower.
Call for Total Cure from all diseases on 08079549042 / doctorgem77@gmail.com .
Sir-Phil
Mod.
The only machine with 100% efficiency is the
carnot engine,
which does not exist practically.
(sirphil)
Spottykay
Publisher
In any machine there is a
way to put the energy inside
and there is a way to take
the energy out.The out put
energy need not be the same
type of input energy.
In any machine as per
conservation of energy the
input and out put energies
must be equal.
But what we speak of
efficiency of a machine is the
ratio of the useful out put
energy to the input energy.
Naturally this will be less
than the total out put energy.
It follows efficiency is less
than 100%.
But we can try our best to
reduce the unused energy
(not used for our purpose)to
be the minimum possible.
For example in machines due
to friction many energy is
being lost as the parts are
heated. But with out friction
no parts will work. So some
minimum amount of energy
has to be wasted (wasted
according to us and not
according to nature).
A car rolls down the road
because of friction and the
same friction reduces
efficiency.
Sir-Phil
Mod.
Nice job Spottykay, but you really sound like an amatuer physicist LOL!
(sirphil)
Spottykay
Publisher
i'm not much Good in science
Mr Paul
Mod.
@Sir-Phil, that carnot machine is not practicable; so it doesnt prove 100% efficiency.
Call for Total Cure from all diseases on 08079549042 / doctorgem77@gmail.com .
Sir-Phil
Mod.
Yeah if you got me correctly, I said it doesnt exist in practical sense though, it is believed to be the only machine with 100% efficiency
(sirphil)
Mr Paul
Mod.
Alright; I can get you.
Call for Total Cure from all diseases on 08079549042 / doctorgem77@gmail.com .
Sir-Phil
Mod.
Am glad you have.
(sirphil)
Mr Paul
Mod.
You're Welcome.
Call for Total Cure from all diseases on 08079549042 / doctorgem77@gmail.com .
Spottykay
Publisher
whats the meaning of carnot engine
Sir-Phil
Mod.
It has been well explained. Bother to scroll up and you wont be asking any questions.
(sirphil)
Spottykay
Publisher
i mean what does the machine does
Sir-Phil
Mod.
I clearly stated that it does not exist in practical sense. Though it is believed to have 100% Efficiency
(sirphil)
Mr Paul
Mod.
@Spottykay, its just like the believe of existence of dragon, which breathe fire out of his mouth; but have you seen such an animal before?
Call for Total Cure from all diseases on 08079549042 / doctorgem77@gmail.com .
Sir-Phil
Mod.
Exactly, its merely an assumption. Its not feasible
(sirphil)
Spottykay
Publisher
ah i cant see it and cant wait for it but i can snap it
Mr Paul
Mod.
O Yes, that is how the case of Carnot engine is.
Call for Total Cure from all diseases on 08079549042 / doctorgem77@gmail.com .
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