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Nina [5.8K]
4 years ago
9

A evolução da malha rodoviária do Brasil é um marco notável

Engineering
1 answer:
elena55 [62]4 years ago
6 0
Mark please send the email to me and please let us
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Which of the following statements are true of computer hardware engineers?
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Answer:

you never mentioned the options

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A steel rod, which is free to move, has a length of 200 mm and a diameter of 20 mm at a temperature of 15oC. If the rod is heate
kherson [118]

Explanation:

thermal expansion ∝L = (δL/δT)÷L ----(1)

δL = L∝L + δT ----(2)

we have δL = 12.5x10⁻⁶

length l = 200mm

δT = 115°c - 15°c = 100°c

putting these values into equation 1, we have

δL = 200*12.5X10⁻⁶x100

= 0.25 MM

L₂ = L + δ L

= 200 + 0.25

L₂ = 200.25mm

12.5X10⁻⁶ *115-15 * 20

= 0.025

20 +0.025

D₂ = 20.025

as this rod undergoes free expansion at 115°c, the stress on this rod would be = 0

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3 years ago
Which 1 of the following did women NOT do during WWII?
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Answer:

Didn't do what, there are no women as answers. Contact me and give me the women.

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The company PureNSafe is designing a portable, solar-powered disinfection system for Army use only. The system is simply an inle
slega [8]

Solution :

The treatment system will operate as the well mixed chamber.

Disinfection rate constant for the UV light, k is 7.80 /s. Number of bacteria in water need to be reduced by 99.9%

Percent reduction of bacteria should be $(1-10^{0.99}) \times 100 =89.7\%$

Volume of the unit chamber is fixed at 2L

Assume the inlet concentration, $C_0$ as 1000

The outlet concentration of bacteria, C should be $1000-\left(1000 \times \frac{89.7}{100}\right)$

                                                                                  = 103

The well mixed chamber will then follow a completely mixed flow reactor model.

Compute the time required :

$t=\frac{1}{k}\left(\frac{C_0}{C}-1\right)$

$t=\frac{1}{7.8}\left(\frac{1000}{103}-1\right)$

  = 1.115 s

Flow through the system is    $\frac{2 \ L}{1.115 \ s}$  = 1.79 L/s

The amount of water treated during the 10 hours of sunlight is 1.79 x 10 x 60 x 60 = 64440 L

4 0
3 years ago
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