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2 years ago

What is the main gas that is causing climate change?

Engineering

1 answer:

Goryan [66]2 years ago

3 0

Answer:

The main gases responsible for the greenhouse effect include carbon dioxide, methane, nitrous oxide, and water vapor which all occur naturally, and fluorinated gases which are synthetic.

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A process engineer performed jar tests for a water in order to determine the optimal pH and dose using alum. A test was conducte

IRINA_888 [86]

Answer:

1) 13 mg/liters

2) 72.22 mg/lit

3) The Alkanity in raw water is not sufficient enough and the kinds of chemicals needed to enhance its acidity are

CaO
KOH
Na2CO3
NaOH
CO2
NaHCO3

Explanation:

1) plot of turbidity versus dose and optimal dose of Alum ( mg/L )

Optimal dose of Alum = 13 mg/liters from the graph attached below

2) Theoretical amount of alkalinity consumed at the optimal dose can be calculated as follows

Alkanity is due to $HCO^-_{3}$

given optimal dose of Alum = 13 mg/liters for question 1

I mole of alum = 2 moles of AL(OH)3

666 grams of alum = 2*27 = 54 grams of AL(OH)3

hence 1 mole of $AL^{+3}$ = (13/54 ) mMole / lit

The moles of HCO3 = 6 * $\frac{13}{54}$ because 1 mole of Alum reacts with 6 moles of HC03

[HCO3] as CaCO3 = 6 * (13/54) * 50

= 72.22 mg/lit (theoretical amount of alkalinity consumed)

3) The Alkanity in raw water is not sufficient enough and the kinds of chemicals needed to enhance its acidity are

CaO
KOH
Na2CO3
NaOH
CO2
NaHCO3

3 0

3 years ago

Give the approximate temperature at which creep deformation becomes an important consideration for each of the following metals:

IrinaVladis [17]

Answer:

The creep temperature for different materials is as follows.

A. Nickel :- $T_{c}$ = 690.4 K

B. Copper :- $T_{c}$ = 542.8 K

C. Iron :- $T_{c}$ = 723.6 K

D. Tungsten :- $T_{c}$ = 1469.2 K

E. Lead :- $T_{c}$ = 240.2 K

F. Aluminium :- $T_{c}$ = 373.2 K

Explanation:

Creep is the slow plastic deformation occur at high elevated temperature.

The approximate temperature for different metals is as follows at which creep becomes considerable.

A. Nickel :- The relation between melting temperature & creep temperature is given by the formula.

$T_{c} = 0.4 T_{m}$

The melting temperature of nickel = 1726 K

Creep temperature $T_{c}$ = 0.4 × 1726

$T_{c}$ = 690.4 K

B. Copper :- The relation between melting temperature & creep temperature for copper is given by the formula.

$T_{c} = 0.4 T_{m}$

The melting temperature of copper = 1357 K

Creep temperature $T_{c}$ = 0.4 × 1357

$T_{c}$ = 542.8 K

C. Iron :- The relation between melting temperature & creep temperature for iron is given by the formula

$T_{c} = 0.4 T_{m}$

The melting temperature of iron = 1809 K

Creep temperature $T_{c}$ = 0.4 × 1809

$T_{c}$ = 723.6 K

D. Tungsten :- The relation between melting temperature & creep temperature for tungsten is given by the formula

$T_{c} = 0.4 T_{m}$

The melting temperature of iron = 3673 K

Creep temperature $T_{c}$ = 0.4 × 3673

$T_{c}$ = 1469.2 K

E. Lead :-The relation between melting temperature & creep temperature for lead is given by the formula

$T_{c} = 0.4 T_{m}$

The melting temperature of lead = 600.5 K

Creep temperature $T_{c}$ = 0.4 × 600.5

$T_{c}$ = 240.2 K

F. Aluminium :- The relation between melting temperature & creep temperature for aluminium is given by the formula

$T_{c} = 0.4 T_{m}$

The melting temperature of lead = 933 K

Creep temperature $T_{c}$ = 0.4 × 933

$T_{c}$ = 373.2 K

8 0

3 years ago

3. Air at 1 atm and 20 0 C flows tangentially on both sides of a smooth flat plate of width W=10 ft and length L=10 ft in the di

8_murik_8 [283]

Answer:

ExplanationAir at 1 atm and 20°C flows tangentially on both sides of a thin, smooth flat plate of ... ... Smooth Flat Plate Of Width W = 10 Ft, And Of Length L 3 Ft In The Direction Of The Flow. The Velocity Outside The Boundary Layer Is Constant At 20 Ft/s.

6 0

3 years ago

Draw a sketch of the following situations identifying the system or control volume, and the boundary of the system or the contro

I am Lyosha [343]

Answer:

Attached below

Explanation:

a) combustion gases in a cylinder during the power stroke is A closed system

b) Combustion gases in a cylinder during the exhaust stroke is an Open system

c) A balloon exhausting air is an Open system

d) It is a system

e) This is a control volume

Attached below is the sketch of the following situations

5 0

3 years ago

(a) Draw the Moore finite state machine (FSM) of an electronic combination lock with a RESET button, two number buttons (0 and 1

Dafna11 [192]

Answer:

Explanation:

There are a total of 6 states and 3 bits in this problem. Whenever the Reset button is pressed, RESET state is called otherwise the state according to the diagram is called. For the combination to be "01011", the input sequence has to be in the same order. If 0 is pressed instead of 1 in state "010", the last state of output ending with 0 will be called and likewise in all the states that follow.

7 0

3 years ago