Answer:
(a) 2.39 MPa (b) 3.03 kJ (c) 3.035 kJ
Explanation:
Solution
Recall that:
A 10 gr of air is compressed isentropically
The initial air is at = 27 °C, 110 kPa
After compression air is at = a450 °C
For air, R=287 J/kg.K
cv = 716.5 J/kg.K
y = 1.4
Now,
(a) W efind the pressure on [MPa]
Thus,
T₂/T₁ = (p₂/p₁)^r-1/r
=(450 + 273)/27 + 273) =
=(p₂/110) ^0.4/1.4
p₂ becomes 2390.3 kPa
So, p₂ = 2.39 MPa
(b) For the increase in total internal energy, is given below:
ΔU = mCv (T₂ - T₁)
=(10/100) (716.5) (450 -27)
ΔU =3030 J
ΔU =3.03 kJ
(c) The next step is to find the total work needed in kJ
ΔW = mR ( (T₂ - T₁) / k- 1
(10/100) (287) (450 -27)/1.4 -1
ΔW = 3035 J
Hence, the total work required is = 3.035 kJ
Answer:
S = 172.69 J/K
Explanation:
For a closed system, the entropy is given as the natural logarithm of microstates.
The number of particles (grains of sand); N = 25
The number of boxes (compartments); M = 1000
Entropy is the logarithm of number of microstates; Thus,
S = In ψ
However, the number of microstates is given by the formula;
ψ = Mⁿ
Thus, S = In Mⁿ
Plugging in the relevant values to obtain;
S = In (1000)^(25)
S = 172.69 J/K
it is undesirable that all of the points should fall extremely near, or exactly on, the centerline of the control chart Because:
- It can make it difficult to interpret patterns and draw conclusions in a run chart.
- It can lead hinder the process, and make it unstable.
<h3>When a
data point falls outside the control limits of a run chart ?</h3>
If a data point falls is said to outside the control limits, we can say that the process is said to be out of one's control and it is good that an investigation is done to ascertain and remove the cause or causes.
So, it is undesirable that all of the points should fall extremely near, or exactly on, the centerline of the control chart Because:
- It can make it difficult to interpret patterns and draw conclusions in a run chart.
- It can lead hinder the process, and make it unstable.
Learn more about data point from
brainly.com/question/3514929
#SPJ1
Answer:
42m/s
Explanation:
Frequency (f) =14Hz and wavelength (λ )=3m
Frequency and wavelength can be related to speed:
speeds(V)=f*λ=14*3=42m/s.
as the public need for preventing injuries and deaths from car crashes became known,laws were enacted to mandate the inclusion of seatbelts in almost all passengers vehicles
