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stellarik [79]
3 years ago
7

A company has a stack that emits a hazardous air pollutant. The ground mass concentration directly downwind of the plume sometim

es exceeds the safe limit (call it cj,safe) and the Department of Environmental Protection (DEP) is requiring a correction to this situation. The company decides to look into building a taller stack, rather than investing in a more sophisticated and very expensive APCS. They hire you as a consultant to calculate how tall the new stack would have to be in order to satisfy DEP.
Required:
a. Generate an equation to determine the stack height hs required such that, for the reflecting ground case, the ground level concentration on the ground directly downwind (y = 0 and z = 0) does not exceed the safe level at any location along the ground.
b. Repeat for the absorbing ground case.
c. Discuss. Is this a good solution for the company’s problem? For the environment?
Engineering
2 answers:
fomenos3 years ago
4 0
Nobody about to do all of that lol
fredd [130]3 years ago
3 0

Answer:

do the wam wam

Explanation:

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zloy xaker [14]

Answer:

False

Explanation:

8 0
3 years ago
Subcooled liquid water flows adiabatically in a constant diameter pipe past a throttling valve that is partially open. The liqui
Llana [10]

Answer:

hi-he = 0

pi-pe  = positive

ui-ue = negative

ti-te = negative

Explanation:

we know that fir the sub cool liquid water is

dQ = Tds = du +  pdv   ............1

and  Tds = dh - v dP         .............2

so now for process of throhling is irreversible when v is constant

then heat transfer is = 0 in irreversible process

so ds > 0

so here by equation 1 we can say

ds  > 0  

dv = 0 as v is constant

so that Tds = du    .................3

and du > 0

ue - ui > 0

and

now by the equation 2 throttling process  

here enthalpy is constant

so dh = 0

and Tds  = -vdP

so ds > 0  

so that -vdP > 0  

as here v is constant

so -dP =P1- P2

so P1-P2 > 0

so pressure is decrease here

5 0
3 years ago
Swing arm restraints are intended to prevent a vehicle from falling off a lift.
castortr0y [4]

The question is asking whether that statement is true or false. Options are;

A) True

B) False

This is about usage of Swing arm restraints.

<em><u>B) False</u></em>

There are different safety features that people employ when a vehicle is lifted. However, for this question, we will only talk about swing arm restraints.

  • Swing arm restraints are lifting restraint devices that are used to prevent a cars arms from shifting or going out of position after that car has been lifted and mounted.

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Read more at; brainly.com/question/17972874

4 0
3 years ago
What is the output of a system with the transfer function s/(s + 3)^2 and subject to a unit step input at time t = 0?
Dominik [7]

Answer:

0

Explanation:

output =transfer function H(s) ×input U(s)

here H(s)=\frac{s}{(s+3)^2}

U(s)=\frac{1}{s} for unit step function

output =H(s)×U(s)

=\frac{s}{(s+3)^2}×\frac{1}{s}

=\frac{1}{(s+3)^2}

taking inverse laplace of output

output=t×e^{-3t}

at t=0 putting the value of t=0 in output

output =0

3 0
3 years ago
What unit of measurment would be used to measure current?
Alex_Xolod [135]

Answer:

The S. I unit of current is Amphere

5 0
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