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Arada [10]
3 years ago
13

You often experiment with everyday materials around you, trying to create new and unique items. You enjoy designing and creating

things that improve your daily tasks. What characteristic of a STEM student are you displaying?
A. technologically-literate

B. inventor

C. innovator

D. problem-solver
Engineering
2 answers:
Archy [21]3 years ago
8 0

answer:D. problem-solver

Alecsey [184]3 years ago
5 0
Answer:D-problem solver
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The first one A, " These are lines of equal air pressure".

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In the 5 Code of Federal Regulations (C.F.R.), it is recommended that an individual has security awareness training before s/he
GarryVolchara [31]

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In which of the following states are you most likely to find a home with a basement and why?
seraphim [82]
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6 0
3 years ago
The components of an electronic system dissipating 180 W are located in a 1-m-long horizontal duct whose cross section is 16 cm
oee [108]

Answer:

a) The exit temperature is 39.25°C

b) The highest component surface is 132.22°C

c) The average temperature for air equal to 35°C is a good assumption because the air temperature at the inlet will increase due to the result in the heat gain produced by the duct and whose surface is exposed to a flow of hot.

Explanation:

a) The properties of the air at 35°C:

p = density = 1.145 kg/m³

v = 1.655x10⁻⁵m²/s

k = 0.02625 W/m°C

Pr = 0.7268

cp = 1007 J/kg°C

a) The mass flow rate of air is equal to:

m=\rho *V = 1.145*0.65=0.7443kg/min=0.0124kg/s

The exit temperature is:

T=T_{i} +\frac{Q}{m*c_{p} } =27+\frac{0.85*180}{0.0124*1007} =39.25°C

b) The mean fluid velocity is:

V_{m} =\frac{V}{A} =\frac{0.65}{0.16*0.16} =25.4m/min=0.4232m/s

The hydraulic diameter is:

D_{h} =\frac{4A}{p} =\frac{4*0.16*0.16}{4*0.16} =0.16m

The Reynold´s number is:

Re=\frac{VD_{h} }{v} =\frac{0.4232*0.16}{1.655x10^{-5} } =4091.36

Assuming fully developed turbulent flow, the Nusselt number is:

Nu=0.023Re^{0.8} *Pr^{0.4} =0.023*4091.36^{0.8} *0.7268^{0.4} =15.69

h=\frac{k*Nu}{D_{h} } =\frac{0.02625*15.69}{0.16} =2.57W/m^{2} C

The highest component surface temperature is:

T=T_{e} +\frac{\frac{Q}{A} }{h} =39.2+\frac{0.85*\frac{180}{4*0.16*1} }{2.57} =132.22°C

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3 years ago
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brilliants [131]
Moreover, these debates often focus on some topics at the expense of other equally important issues. For example, there is a legitimate concern ...
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