Answer:
a. impossible
b. possible and reversible
c. possible and irreversible
Explanation:
a. 1000kw
Qh - Wnet
we have
QH = 1500
wnet = 1000
1500 - 1000
= 500kw
σcycle =
Qh = 1500
Th = 1000
Tc = 500
Qc = 500
solving this using LCM
= -0.5
the cycle is<u> impossible since -0.5<0</u>
b. 750Kw
Qc = 1500 - 750
=750Kw
Qh = 1500
Th = 1000
Tc = 500
Qc = 750
σ-cycle
This cycle <u>is possible and it is also reversible</u>
<u></u>
c. 0 kw
Qc = 1500-0
= 1500
Qh = 1500
Th = 1000
Tc = 500
Qc = 1500
σ- cycle
1.5>0
so this <u>cycle is possible and irreversible</u>
Answer:
Answer is c. 2
Explanation:
Since friction is present at the contact between 2 materials thus coefficient of friction always involve 2 materials
Answer:
a) 15.37 mm
b)
c) 5.7186 W/m². K
d) 0.60 m
Explanation:
Given that :
The surface temperature = 130°C = ( 130+ 273 ) K = 473 K
suspended in quiescent air at 25°C = ( 25 + 273 ) K = 298 K
Atmospheric Pressure = 1 atm
The properties obtained from Table A - 4 include :
v =
k = 0.03 W/m K
Pr = 0.700
η = 5
Hence, the boundary layer thickness at a location 0.15 m measured from the lower edge is 15.37 mm
b) The maximum velocity in the boundary layer with f'(n) = 0.275
u = 0.3659 m/s
the maximum velocity in the boundary layer at this location is 0.3659 m/s
the position in the boundary layer where the maximum occur is calculated as:
3.074 mm
c) Using the similarity solution result, , determine the heat transfer coefficient 0.15 m from the lower edge.
we know that:
=
= 28.593
Making the subject from the above formula:
= 5.7186 W/m². K
d) to determine the location on the plate that the boundary layer we become turbulent ; we have the following:
0.60 m
Answer:
the concept of user centred design is the idea of putting your clients best needs in mind. you need to be empathic and understanding of how to make their life easier. by doing research you can do this. for example the design in figure 9 shows an umbrella with a canopy. the canopy can deflect rain and still have the easy design of an umbrella. this makes it not only easier to use but functional.
Explanation:
i wrote this myself so copy it or just rewrite it, it doesnt matter