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3 years ago

What percentage of the map would have unhealthy levels of arsenic (140 total squares)?

Engineering

1 answer:

Daniel [21]3 years ago

4 0

Answer:

Explanation:

so you said 140 in total and it's a square

it's basically finding the perimeter of the square

so 35 is each side of the square that I am imagining in my head

so if you add 35...4 times you will get 140

for example:35

+ 35

140

or 35×4=140

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Hot air at an average temperature of 100 degC flows through a 3 m long tube with an inside diameter of 60 mm. The temperature of

Arte-miy333 [17]

Answer:

$\dot Q = 912.017\,W$

Explanation:

The heat transfer rate due to convection is calculated by this formula:

$\dot Q = h_{air}\cdot A_{tube, in}\cdot (T_{air} - T_{tube})$

The output is determined by replacing terms:

$\dot Q = (20.1\,\frac{W}{m^{2}\cdot ^{\textdegree}C})\cdot (\pi )\cdot (0.06\,m)\cdot (3\,m)\cdot (100^{\textdegree}C-20^{\textdegree}C)$

$\dot Q = 912.017\,W$

6 0

3 years ago

Read 2 more answers

A desktop computer is to be cooled by a fan whose flow rate is 0.34 m3 /min. Determine the mass flow rate of air through the fan

Aleks [24]

Answer:

m = 0.238 kg

min

r = 0.063m

3 0

3 years ago

What does drivetrain mean in coding?

Rudik [331]

Answer:

A drivetrain allows a robot to be mobile by using wheels, tank treads, or another method. A drivetrain is sometimes referred to as a drive base. Identifying which kind of drivetrain to use is one of the first considerations when designing a robot.

Explanation:

Hope this helps! Brainliest plz!

4 0

3 years ago

The author claims that engineers should always have the final say and last word when it comes to setting safety standards. Selec

Lisa [10]

Answer:

I select false because engineers are not the only thing we have, we have scientists doctors mathematicians and much more to give safety standards

4 0

4 years ago

Read 2 more answers

An ocean thermal energy conversion system is being proposed for electric power generation. Such a system is based on the standar

Dennis_Churaev [7]

Answer:

a) the heat exchanger area required for the evaporator is 11178.236 m²

b) the required flow rate is 1993630.38 kg/s

Explanation:

Given the data in the question;

Water temperature near the surface = 300 K

temperature at reasonable depths ( cold ) = 280 K

power plant output W' = 2 MW

efficiency η = 3% = 0.03

we know that; efficiency η = W' $_{power-out$ / Q $_{supplied$

we substitute

0.03 = 2 / Q $_{supplied$

Q $_{supplied$ = 2 / 0.03

Q $_{supplied$ = 66.667 MW = 66.667 × 10⁶ Watt

T $h_{in$ = 300 K T $h_{out$ = 292 K

T $c_{in$ = 290 K T $c_{out$ = 290 K

Now, Heat transfer in evaporator;

Q = UA( LMTD )

LMTD = (ΔT₁ - ΔT₂) / ln( ΔT₁ / ΔT₂ )

first we get ΔT₁ and ΔT₂

ΔT₁ = T $h_{in$ - T $c_{out$ = 300 - 290 = 10 K

ΔT₂ = T $h_{out$ - T $c_{in$ = 292 - 290 = 2 K

so we substitute into our equation;

LMTD = (10 - 2) / ln( 10 / 2 )

LMTD = 8 / ln( 5 )

LMTD = 8 / 1.6094379

LMTD = 4.97

a) Heat transfer Area will be;

Q $_H$ = UA( LMTD )

we substitute

66.667 × 10⁶ = 1200 × A × 4.97

66.667 × 10⁶ = 5964 × A

A = (66.667 × 10⁶) / 5964

A = 11178.236 m²

Therefore, the heat exchanger area required for the evaporator is 11178.236 m²

b) Flow rate

we know that;

Q $_H$ = m'C $_P$ ( $T_{in$ - $T_{out$ )

specific heat capacity of water Cp = 4.18 (kJ/kg∙°C)

we substitute

66.667 × 10⁶ = m' × 4.18 × ( 300 - 292 )

66.667 × 10⁶ = m' × 33.44

m' = ( 66.667 × 10⁶ ) / 33.44

m' = 1993630.38 kg/s

Therefore, the required flow rate is 1993630.38 kg/s

7 0

3 years ago