Explanation:
Thermodynamics system :
Thermodynamics system is a region or space in which study of matters can be done.The system is separated from surroundings by a boundary this boundary maybe flexible or fixed it depends on situations.The out side the system is called surroundings.
Generally thermodynamics systems are of three types
1.Closed system(control mass system)
Only energy transfer take place ,no mass transfer take place.
2.Open system(control volume system)
Both mass as well as energy transfer take place.
3.Isolated system
Neither mass or nor energy transfer take place.
At steady state ,property is did not changes with respect to time.
Crystalline silicon
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Answer:
(b)False
Explanation:
defined as
=
Where x is the distance from centroidal x-axis
y is the distance from centroidal y-axis
dA is the elemental area.
The product of x and y can be positive or negative ,so the value of can be positive as well as negative .
So from the above expressions we can say that the product of 
is different from .
Answer:
Explanation:
The model for the turbine can be derived by means of the First Law of Thermodynamics:
![-\dot Q_{out}-\dot W_{out} +\dot m \cdot \left[(h_{in}-h_{out})+\frac{1}{2}\cdot (v_{in}^{2}-v_{out}^{2}) + g\cdot (z_{in}-z_{out})\right] =0](https://tex.z-dn.net/?f=-%5Cdot%20Q_%7Bout%7D-%5Cdot%20W_%7Bout%7D%20%2B%5Cdot%20m%20%5Ccdot%20%5Cleft%5B%28h_%7Bin%7D-h_%7Bout%7D%29%2B%5Cfrac%7B1%7D%7B2%7D%5Ccdot%20%28v_%7Bin%7D%5E%7B2%7D-v_%7Bout%7D%5E%7B2%7D%29%20%2B%20g%5Ccdot%20%28z_%7Bin%7D-z_%7Bout%7D%29%5Cright%5D%20%3D0)
The work produced by the turbine is:
![\dot W_{out}=-\dot Q_{out} +\dot m \cdot \left[(h_{in}-h_{out})+\frac{1}{2}\cdot (v_{in}^{2}-v_{out}^{2}) + g\cdot (z_{in}-z_{out})\right]](https://tex.z-dn.net/?f=%5Cdot%20W_%7Bout%7D%3D-%5Cdot%20Q_%7Bout%7D%20%2B%5Cdot%20m%20%5Ccdot%20%5Cleft%5B%28h_%7Bin%7D-h_%7Bout%7D%29%2B%5Cfrac%7B1%7D%7B2%7D%5Ccdot%20%28v_%7Bin%7D%5E%7B2%7D-v_%7Bout%7D%5E%7B2%7D%29%20%2B%20g%5Ccdot%20%28z_%7Bin%7D-z_%7Bout%7D%29%5Cright%5D)
The mass flow and heat transfer rates are, respectively:
Finally:
