Answer:
a)
, b)
, c) 
Explanation:
A turbine is a device which works usually in steady state and assumption of being adiabatic means no heat interactions between steam through turbine and surroudings and produce mechanical work from fluid energy. Changes in gravitational energy can be neglected. This system can be modelled after the First Law of Thermodynamics:

a) Change in kinetic energy

![\Delta \dot K = \frac{1}{2} \cdot \left(12.6\,\frac{kg}{s} \right) \cdot \left[\left(80\,\frac{m}{s} \right)^{2}-\left(50\,\frac{m}{s} \right)^{2}\right]](https://tex.z-dn.net/?f=%5CDelta%20%5Cdot%20K%20%3D%20%5Cfrac%7B1%7D%7B2%7D%20%5Ccdot%20%5Cleft%2812.6%5C%2C%5Cfrac%7Bkg%7D%7Bs%7D%20%5Cright%29%20%5Ccdot%20%5Cleft%5B%5Cleft%2880%5C%2C%5Cfrac%7Bm%7D%7Bs%7D%20%5Cright%29%5E%7B2%7D-%5Cleft%2850%5C%2C%5Cfrac%7Bm%7D%7Bs%7D%20%5Cright%29%5E%7B2%7D%5Cright%5D)


b) Power output



c) Turbine inlet area
Turbine inlet area can be found by using the following expressions:






Missing an attached sheet with the sound waves. Please add the attached sheet so I can properly help.
Thanks! :D
Answer:
v = 27.456 m/s
Explanation:
The support pressure needed of the water in the straw can be calculated by the formula
Given that,
P = r*g*h
= 1000*9.8*0.05 Pa.= 490 Pa
This pressure is compensated by 0.5*r*v^2 of the air,
Hence,
0.5*1.3*v^2 = 490
velocity of air blown into the straw =
v = 27.456 m/s
i squared r = 0.03x0.03x1000=3x0.03x10=.9W