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3 years ago

Select the correct answer.

Engineering

1 answer:

cricket20 [7]3 years ago

5 0

Answer:

The power generated by a wind farm is not constant because of irregular wind patterns.

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When determining risk, it is necessary to estimate all routes of exposure in order to determine a total dose (or CDI). Recognizi

Allushta [10]

Answer:

The following are the solution to this question:

Explanation:

The Formula for calculating CDI:

$\bold{CDI = \frac{C \times CR \times EF \times ED}{BW \times AT}}$

$_{where} \\ CDI = \text{Chronic daily Intake rate} (\frac{mg}{kg-day})} \\\\\text{C = concentration of Toluene}\\\\\text{CR = contact rate} \frac{L}{day}\\\\\text{EF = Exposure frequency} \frac{days}{year}\\\\\text{ED = Exposure duration (in years)} = 10 \ \ years\\\\\text{BW = Body weight (kg) = 70 kg for adult}\\\\ \text{AT = average period of exposure (days) }$

calculating the value of AT:

$= 365 \frac{days}{year} \times 70 \ year \\\\ = 25550 \ days$

calculating the value of Intake based drinking:

$C = 1 \ \frac{mg}{L}$

$CR = 2 \frac{L}{day}$ Considering that adult females eat 2 L of water a day,

EF = 350 $\frac{days}{year}$ for drink

calculating the CDI value:

$\to CDI = \frac{(1 \times 2 \times 350 \times 10)}{(70 \times 25550)}\\\\$

$= \frac{(2 \times 3500)}{(70 \times 25550)}\\\\ = \frac{(7000)}{(70 \times 25550)}\\\\ = \frac{(100)}{(25550)}\\\\=0.00391 \frac{mg}{ kg-day}$

Centered on inhalation, intake:

$C = \frac{1 \mu g} { m^3} \ \ \ or \ \ \ \ 0.001 \ \ \frac{mg}{m^3}\\\\CR = 20 \frac{m^3}{day}\\\\EF = 15 \frac{min}{day} \ \ or\ \ 5475 \frac{min}{yr} \ \ \ or \ \ 3.80 \frac{days}{year}\\$

calculating the value of CDI:

$\to CDI = \frac{(0.001 \times 20 \times 3.80 \times 10)}{(70 \times 25550)}$

$= \frac{(0.76)}{(1788500)}\\\\= 4.24 \times 10^{-7} \ \ \frac{mg}{kg-day}$

7 0

3 years ago

What is the temperature dependency of the electrical conductivity for metals and semiconductors??

geniusboy [140]

Answer and Explanation:

TEMPERATURE DEPENDENCY ON ELECTRICAL CONDUCTIVITY OF METALS : Metals are good conductors of electricity but when we increase the temperature the free electrons of metals collide with each other due to heat.There collision become very fast and so the resistance increases and so the electrical conductivity of metals decreases on increasing temperature.

TEMPERATURE DEPENDENCY ON ELECTRICAL CONDUCTIVITY OF SEMICONDUCTOR : The electrical conductivity of semiconductor is mainly sue to presence of impurities and defects as the temperature increases the impurities and defects also increases so the electrical conductivity of semiconductor increases on increasing temperature.

3 0

3 years ago

1. A copper block of volume 1 L is heat treated at 500ºC and now cooled in a 200-L oil bath initially at 20◦C. Assuming no heat

MaRussiya [10]

Answer:

final temperature T = 24.84ºC

Explanation:

given data

copper volume = 1 L

temperature t1 = 500ºC

oil volume = 200 L

temperature t2 = 20ºC

solution

Density of copper $\rho$ cu = 8940 Kg/m³

Density of light oil $\rho$ oil = 889 Kg/m³

Specific heat capacity of copper Cv = 0.384 KJ/Kg.K

Specific heat capacity of light oil Cv = 1.880 KJ/kg.K

so fist we get here mass of oil and copper that is

mass = density × volume ................1

mass of copper = 8940 × 1 × $10^{-3}$ = 8.94 kg

mass of oil = 889 × 200 × $10^{-3}$ = 177.8 kg

so we apply here now energy balance equation that is

$M(cu)\times Cv \times (T-T1)_{cu} + M(oil) \times Cv\times (T-T2)_{oil}$ = 0

put here value and we get T2

$8.94\times 0.384 \times (T-500) + 177.8 \times 1.890\times (T-20)$ = 0

solve it we get

T = 24.84ºC

7 0

3 years ago

In the figure show, what's the distance from point H to point C?

padilas [110]

Answer:

Explanation:

I think not sure hehe

4 0

2 years ago

'Energy' has the potential to:

Kazeer [188]

answer:

Energy' has the potential to:<u>do work</u>

b.do work

6 0

2 years ago