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3 years ago

Which item is needed for clouds to develop?

Physics

2 answers:

Andrew [12]3 years ago

7 0

Chile I wish I knew good luck <3

Rasek [7]3 years ago

7 0

Answer:

snow or rain

Explanation:

i know it has to be some kind of water , but I just don't know which one sadly . hope this helped :) !

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9.96 kg of R-134a at 300 kPa fills a rigid container whose volume is 14 L. Determine the temperature and total enthalpy in the c

Archy [21]

Answer:

At 300 kPa: The temperature is 0.529 ºC and the total enthalpy, 2016.77kJ.

At 600 kPa: The temperature is 21.45 ºC and the total enthalpy, 2317.00 kJ.

Explanation:

1. Get the container volume in cubic meters: $1m^{3}=1000L$

$V=14L*\frac{1m^{3}}{1000L} =0.014m^{3}$

2. Find the specific volume of R-134a:

$v=\frac{V}{m}=\frac{0.014m^{3}}{9.96kg}=0.001416\frac{m^{3}}{kg}$

3. Find the phase of R-134a, for this, look at the steam tables (Note: I am using the table B.5.1 from van Wylen 6th Edition.) Look for a pressure of 300 kPa at the table; I found this values:

T(ºC) P(kPa) vf( $\frac{m^{3}}{kg}$ vg( $\frac{m^{3}}{kg}$

0 294.0 0.000773 0.06919

5 350.9 0.000783 0.05833

It is possible to predict that the properties of saturated R134-a at 300 kPa would be so closely to that of 294 kPa. From that data we find that the specific volume of our R134-a is between vf and vg, so we conclude that it is a vapor liquid mixture.

4. Find the quality (x)

From a linear interpolation for the pressure, it is possible to know the saturation data for 300 KPa:

T(ºC) P(kPa) vf( $\frac{m^{3}}{kg}$ vg( $\frac{m^{3}}{kg}$

0.529 300 0.0007405 0.06796

Applying the quality relation for specific volume:

$v=v_{f}+xv_{fg}\\x=\frac{v-v_{f}}{v_{fg}}\\x=0.009989$

The total enthalpy is calculated in the same way:

$h=h_{f}+xh_{fg}\\h=200.71+0.00898*197.96=202.48 \frac{kJ}{kg}$

$H=202.48*9.96=2016.77kJ$

The temperature is 0.529 ºC and the total enthalpy, 2016.77kJ.

When the substance is heated, the volume remains constant because the container is rigid, so the calculation requires to do the same process again with 600 kPa.

T(ºC) P(kPa) vf( $\frac{m^{3}}{kg}$ vg( $\frac{m^{3}}{kg}$

21.45 600 0.000820 0.03458

hf( $\frac{kJ}{kg}$ hg( $\frac{kJ}{kg}$

229.56 406.13

$x=0.0173$

$h=232.63 \frac{kJ}{kg}$

$H=m*h=2317.00kJ$

The temperature is 21.45 ºC and the total enthalpy, 2317.00 kJ.

3 0

4 years ago

Which of the following is a business product?

worty [1.4K]

Answer:

Explanation:

3 0

3 years ago

B all figures represents molecules

Volgvan

C. Figure 11 and figure 1v are both compounds

5 0

3 years ago

Select all that apply. The resistance to an object being pulled over a surface is called _____. starting friction, sliding frict

jok3333 [9.3K]

That is kinetic friction.

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3 years ago

Read 2 more answers

Match these names with the correct statements. 1. said sun revolved around earth Clyde Tombaugh 2. said earth revolved around su

Murljashka [212]

Answer:

1. Ptolemy.

2. Nicolaus Copernicus.

3. Tycho Brahe

4. Galileo Galilei

5. Isaac Newton

6. William Herschel

7. Johann Galle

8. Clyde Tombaugh

9. Albert Einstein.

10. Edwin Hubble

11. Karl Jansky.

12. Grote Weber.

Explanation:

1. Ptolemy: said sun revolved around earth.

2. Nicolaus Copernicus: aid earth revolved around sun.

3. Tycho Brahe: analyzed motions of planets.

4. Galileo Galilei: first used refracting telescope for astronomy.

5. Isaac Newton: invented reflecting telescope.

6. William Herschel: discovered the planet Uranus.

7. Johann Galle: discovered the planet Neptune.

8. Clyde Tombaugh: discovered the dwarf planet Pluto.

9. Albert Einstein: developed special and general theories of relativity.

10. Edwin Hubble: demonstrated that universe is expanding.

11. Karl Jansky: discovered radio waves from the center of the Milky Way.

12. Grote Weber: an amateur astronomer who built the first radio telescope.

8 0

3 years ago