Answer:
-3744.45 kW
Explanation:
The energy balance for a turbine is the following:
Where:
U = internal energy, P= pressure, v=volume, g= gravity, z= height, C= velocity, q= heat, W= power.
Since it is a well-insulated turbine q= 0.
In steady state m (mass flow) is constant.
Where 
is the specific volume and A = area.
There is no information about a change in height during the process so we can say that the term (gz) in the equation both in the inlet (e) and outlet (s) is zero.
In the inlet the velocity is negligible so 
is zero.
Also, enthalpy (h) is:
Reorganizing the equation with this information we have
in kW
We can get the enthalpy from thermodynamic tables for the air with the conditions in the inlet and in outlet. These are:
Mass flow
The area is the area of the circle 
We can get the specific volume from thermodynamics tables for air at 100°C. We use this condition because we know the diameter and the velocity in the outlet. This value is
1.057 
Mass flow is
So power is:
A look, a glance, especially a quick or furtive one.
Answer:
C. Decrease your consumption of beef.
Explanation:
The production of beef needs lots of land, which leads to trees being cut down, releasing carbon dioxide. Also, the ruminant animals used to produce beef end up farting a lot from their diets, and these farts are of high metane, which leads to greenhouse gases being emitted in the athmosphere.
Common plant proteins, otherwise, produce way less of these gases.
So the correct answer is:
C. Decrease your consumption of beef.
Answer:
P=- 88.41 KW
Negative sign indicates that power is given to the system.
Explanation:
Given that
P₂=500 KPa
T₂=130°C
V₂=100 m/s
mass flow rate ,m= 0.8 kg/s
Lets take inlet condition for air
T₁=25°C
P₁=100 KPa
V₁=0 m/s
We know that
Heat capacity for air Cp=1.005 KJ/kg.k
We know that for air change in enthalpy only depends only on temperature
Now from first law for open system
W=-110.52 KJ/kg
Shaft power P = m .W
P = -110.52 x 0.8
P=- 88.41 KW
Negative sign indicates that power is given to the system.
