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Alex_Xolod [135]

3 years ago

12

Why does my man bun not have its own erodynamics

2 answers:

Aloiza [94]3 years ago

7 0

Answer:

umm okay for starters I have no clue lol.

Neporo4naja [7]3 years ago

6 0

what is aerodynamics????

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Air at 400kPa, 970 K enters a turbine operating at steady state and exits at 100 kPa, 670 K. Heat transfer from the turbine occu

Sonja [21]

Answer:

a

The rate of work developed is $\frac{\r W}{\r m}= 300kJ/kg$

b

The rate of entropy produced within the turbine is $\frac{\sigma}{\r m}= 0.0861kJ/kg \cdot K$

Explanation:

From the question we are told

The rate at which heat is transferred is $\frac{\r Q}{\r m } = - 30KJ/kg$

the negative sign because the heat is transferred from the turbine

The specific heat capacity of air is $c_p = 1.1KJ/kg \cdot K$

The inlet temperature is $T_1 = 970K$

The outlet temperature is $T_2 = 670K$

The pressure at the inlet of the turbine is $p_1 = 400 kPa$

The pressure at the exist of the turbine is $p_2 = 100kPa$

The temperature at outer surface is $T_s = 315K$

The individual gas constant of air R with a constant value $R = 0.287kJ/kg \cdot K$

The general equation for the turbine operating at steady state is \

$\r Q - \r W + \r m (h_1 - h_2) = 0$

h is the enthalpy of the turbine and it is mathematically represented as

$h = c_p T$

The above equation becomes

$\r Q - \r W + \r m c_p(T_1 - T_2) = 0$

$\frac{\r W}{\r m} = \frac{\r Q}{\r m} + c_p (T_1 -T_2)$

Where $\r Q$ is the heat transfer from the turbine

$\r W$ is the work output from the turbine

$\r m$ is the mass flow rate of air

$\frac{\r W}{\r m}$ is the rate of work developed

Substituting values

$\frac{\r W}{\r m} = (-30)+1.1(970-670)$

$\frac{\r W}{\r m}= 300kJ/kg$

The general balance equation for an entropy rate is represented mathematically as

$\frac{\r Q}{T_s} + \r m (s_1 -s_2) + \sigma = 0$

=> $\frac{\sigma}{\r m} = - \frac{\r Q}{\r m T_s} + (s_1 -s_2)$

generally $(s_1 -s_2) = \Delta s = c_p\ ln[\frac{T_2}{T_1} ] + R \ ln[\frac{v_2}{v_1} ]$

substituting for $(s_1 -s_2)$

$\frac{\sigma}{\r m} = \frac{-\r Q}{\r m} * \frac{1}{T_s} + c_p\ ln[\frac{T_2}{T_1} ] - R \ ln[\frac{p_2}{p_1} ]$

Where $\frac{\sigma}{\r m}$ is the rate of entropy produced within the turbine

substituting values

$\frac{\sigma}{\r m} = - (-30) * \frac{1}{315} + 1.1 * ln\frac{670}{970} - 0.287 * ln [\frac{100kPa}{400kPa} ]$

$\frac{\sigma}{\r m}= 0.0861kJ/kg \cdot K$

5 0

4 years ago

A 10MHz clock frequency is applied to a cascaded counter consisting of a modulus-5 counter, a modulus-8 counter and two modulus-

rewona [7]

If a clock frequency is applied to a cascaded counter, The lowest output frequency available will be

The lowest output frequency will be = $2.5kHz$

<h3>Cascade Counter</h3>

For a cascade counter,

Overall frequency = $5*8*10*10$

Overall frequency = $4000$

<h3>Lowest Frequency</h3>

Therefore,

the lowest frequency

$F = \frac{10*10^6}{4*10^3}\\\\F = 2500Hz\\\\F = 2.5kHz$

For more information on frequency, visit

brainly.com/question/17029587?referrer=searchResults

4 0

2 years ago

Adam has 5 barrels of different volumes. The barrel of which volume can contain the most liquid?

Natalija [7]

Answer:

D

Explanation:

5 0

2 years ago

2. Explain advantages and disadvantages of computer.<br>Each five.

Salsk061 [2.6K]

Answer:

Hope it helps...

Explanation:

-the main advantages and benefits you'll get from using a computer.

Increase your productivity. ...

Connects you to the Internet. ...

Can store vast amounts of information and reduce waste. ...

Helps sort, organize, and search through information. ...

Get a better understanding of data. ...

Keeps you connected.

the disadvantages to using a computer and what type of problems you may personally encounter.

Carpal tunnel and eye strain. ...

Too much sitting. ...

Short attention span and too much multitasking. ...

Can limit learning and create a dependency. ...

Potential of loss of privacy. ...

Time sink and lots of distractions.

PLEASE THANK MY ANSWER

3 0

3 years ago

What is a jack plane used for

kolezko [41]

A jack plane is a general purpose woodworking bench plane, used for dressing timber down to the correct size in preparation for truing and/or edge jointing.

I hope this helps you :)

4 0

3 years ago