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2 years ago

40 POINTS IF ANSERED WITHIN 10 MINS

Engineering

2 answers:

jek_recluse [69]2 years ago

3 0

A It can show changes that occur in many different parts of Earth at the same time is the answer (I think)…

Nady [450]2 years ago

3 0

Right ones are. It can show changes that occur in many different parts of the Earth at the same time, and It can be used to show how the parts of the cycle relate to one another.

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A wastewater treatment plant discharges 1.0 m3/s of effluent having an ultimate BOD of 40.0 mg/ L into a stream flowingat 10.0 m

kondaur [170]

Answer:

a) 6.4 mg/l

b) 5.6 mg/l

Explanation:

Given data:

effluent Discharge Q_w = 1.0 m^3.s

Ultimate BOD L_w = 40 mg/l

Discharge of stream Q_r = 10 m^3.s

Stream ultimate BOD L_r = 3 mg/l

a) Ultimate BOD of mixture $= \frac{Q_w l_w + Q_r L_r}{Q_w + Q_r}$

$= \frac{1*40 + 10*3}{10 +1} = 6.4 mg/l$

b) utlimate BOD at 10,000 m downstream

$t =\frac{distance}{speed} = \frac{10,000}{\frac{Q_r +Q+w}{55}} \times \frac{hr}{3600} \times \frac{day}{24 hr}$

putting $Q_r + Q_w = 1+ 10 = 11 m^3/s$

t = 0.578 days

we know

$L_t = L_o e^{-kt}$

$L_t = 6.4 \times e^{-0.22 \times 0.578}$

$L_t = 5.6 mg/l$

7 0

3 years ago

The actual tracking weight of a stereo cartridge that is set to track at 3 g on a particular changer can be regarded as a contin

AlexFokin [52]

Answer: The actual tracking weight of a stereo cartridge that is set to track at 3 g on a particular changer can be regarded as a continuous rv X with the following

Explanation:

8 0

3 years ago

An alloy is evaluated for potential creep deformation in a short-term laboratory experiment. The creep rate is found to be 1% pe

LenaWriter [7]

Answer:

a) Q = 251.758 kJ/mol

b) creep rate is $= 1.751 \times 10^{-5} \% per hr$

Explanation:

we know Arrhenius expression is given as

$\dot \epsilon =Ce^{\frac{-Q}{RT}$

where

Q is activation energy

C is pre- exponential constant

At 700 degree C creep rate is $\dot \epsilon = 5.5\times 10^{-2}$ % per hr

At 800 degree C creep rate is $\dot \epsilon = 1$ % per hr

activation energy for creep is $\frac{\epsilon_{800}}{\epsilon_{700}}$ = $= \frac{C\times e^{\frac{-Q}{R(800+273)}}}{C\times e^{\frac{-Q}{R(700+273)}}}$