Explanation:
Acoustic.
In general, soft, pliable, or porous materials (like cloths) serve as good acoustic insulators - absorbing most sound, whereas dense, hard, impenetrable materials (such as metals) reflect most.
Answer:
Explanation:
Define the purpose of the survey.
Make every question count.
Keep it short and simple.
Ask direct questions.
Ask one question at a time.
Avoid leading and biased questions.
Answer:
starburst
Explanation:
There are many different kinds of "hazard symbols," which are being used in order for people to recognize what kind of material they are handling. When it comes to "pictograms," the symbol for a hazard class of explosive is an exploding bomb that shows a<em> starburst effect.</em> An example of such chemical is the <em>"organic peroxide" </em>and other<u> self-reactive chemicals.</u>
A "flame" is a hazard symbol for<em> flammable substances</em>. A<em> </em>"gas cylinder" is a hazard symbol for <em>gases that are located in containers that are under pressure.</em> A "test tube" is a hazard symbol for <em>substances/materials that cause corrosion to skin.</em>
Answer:
The process is not possible.
Explanation:
We know for ideal condition, the work done for isothermal process is
=
and for ideal gas, we know PV = mRT
Therefore, = mRT
= mRT
= 0.287 x 400
= -126.12 kJ/kg (negative sign indicates that the process is compressive, so work input to the compressor is 126.12 kJ/kg )
Now we know for adiabatic compression process
P = C
We know
= 556 K
For adiabatic work done, =
=
=
= -99.49 kJ/kg (negative sign indicates that the process is compressive, so work input to the compressor is 99.49 kJ/kg )
We know that in isothermal process, work input to the compressor is minimum. But in the above adiabatic polytropic process, work input to the compressor is less than the work done in the isothermal process.
Thus the process is not possible.