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Anastaziya [24]
3 years ago
12

A rigid, insulated tank that is initially evacuated is connected though a valve to a supply line that carries steam at 1 MPa and

300∘C. Now the valve is opened, and steam is allowed to flow slowly into the tank until the pressure reaches 1 MPa, at which point the valve is closed.
Determine the final temperature of the steam in the tank, in ∘C.
Physics
1 answer:
meriva3 years ago
6 0

Answer:

Final Temperature of the steam tank = 456.4°C

Explanation:

Assuming it to be a uniform flow process, kinetic and potential energy to be zero, and work done and heat input to be zero also.  We can conclude that,

Enthalpy of the steam in pipe = Internal Energy of the steam in tank

Using the Property tables and Charts - Steam tables,  

At Pressure= 1 MPa and Temperature= 300°C,

Enthalpy = 3051.2 kJ/kg

At Pressure= 1 MPa and Internal Energy= 3051.2 kJ/kg,

Temperature = 456.4°C.

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AysviL [449]

The argon molecules become solid when the temperature decrease from 20C to -190 C.

<h3>What changes occur in argon?</h3>

The changes in arrangement and movement of the particles of the argon occurs as the temperature of the air decreased because the argon gas begins to freeze. The freezing point of argon is -189 Celsius so when the temperature decrease from 20C to -190 C, the argon molecules becomes solid.

So we can conclude that the argon molecules become solid when the temperature decrease from 20C to -190 C.

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2 years ago
Poorly treated municipal wastewater is discharged to a stream. The river flow rate upstream of the discharge point is Qu/s = 8.7
Musya8 [376]

Answer

given,

Q u  = 8.7 m³/s

Q d= 0.9 m³/s

BOD concentration = 50 mg/L

a) BOD concentration at the down stream

C_{down}=\dfrac{0.9\times 50}{8.7+0.9}

C_{down}=\dfrac{0.9\times 50}{9.6}

               = 4.69 mg/L

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cross sectional area = 10 m²

velocity steam = \dfrac{8.7+0.9}{10}

                        = 0.96 m/s

time taken to move 50 km down stream =\dfrac{50 \times 1000}{0.96}

                                                                  = 52083.3 s

                                                                  = \dfrac{52083.3}{3600\times 24}

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Anuta_ua [19.1K]

<u>The number of variations the dealership have is 40 cars</u>.

Data given;

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To get that, we simply multiply the numbers of colors available, the number of transmission and the makes of car available.

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