Do you notice differences in aerosol concentration at different latitudes

One kilogram of water fills a 0.140 m^3 rigid container at an initial pressure of 1.8 MPa. The container is then cooled to 40°C.

Pavel [41]

Answer:

T1 = 299.18 °C

P2 = 0.00738443 MPa

Explanation:

From the data, we can get two properties for the initial condition. These are pressure and specific volume.

The pressure is 1.8 MPa and the specific volume, we can get it with the mass and volume of the container, since it’s filled this is also the volume of the water in it.

$v=\frac{vol (m^{3})}{mass (kg)} = \frac{0.140 m^{3}}{1 kg} = 0.140 \frac{ m^{3}}{kg}$

When we check in the thermodynamic tables, the conditions for saturation at 1.8 MPa we found the following:

$P^{sat} = 1.8 MPa$

$T^{sat} = 207.12 C$

$v_{g} = 0.1103\frac {m^{3}}{kg}$ specific volume for the saturated vapor

$v_{l} = 0.001167 \frac{m^{3}}{kg}$ specific volume for the saturated liquid

Since the specific volume in our condition is higher that the specific volume for the saturated vapor, we have a superheated steam.

Looking in the thermodynamic tables for superheated steam we found that the temperature where the steam has a specific volume of $0.140 \frac{ m^{3}}{kg}$ at 1.8 MPa is 299.18 °C. This is the initial temperature in the container.

Since the only information that we have about the final condition is that the container was cooled. We can assume that it was cooled until a condition of saturation. So, the final pressure for the water will be the pressure of saturation for a temperature of 40°C. From thermodynamic tables we get:

$P^{sat} at 40C = 0.00738443 MPa$

7 0

3 years ago

A disk is rotating around an axis located at its center. The angular velocity is 0.5 rad/s. The radius of the disk is 0.4 m. Wha

dimaraw [331]

Answer:

0.2 m/s

Explanation:

The velocity of a point on the edge of a disk rotating disk can be calculated as:

$v=\omega*r$

Where $\omega$ is the angular velocity and r the radius of the disk. This leads to:

$v=0.5\,rad/s\,*\,0.4\,m=0.2\,m/s$

4 0

4 years ago

Read 2 more answers

Why Your first project as the new web designer at Smart Design is to increase web traffic to help boost web orders. Before you b

Tju [1.3M]

(D) It will let you know how the visitors are using the site and where there might be problem

Explanation:

Before re -designing a website the designer needs to answer the following question:

Is the design of the website outdated
Is there any decrease in the sales
Are their any complains regarding the users experience or design related issues

If the answers of the above mentioned question is yes then , a website redesign is important.

To find the answer of the above mentioned question the website designer need to know how the visitors are using the site and where there might be problem.

The answer for above question is (D)

8 0

3 years ago

Anyone know anything about Drivers Ed?

Montano1993 [528]

Answer:

DRIVERS ED is about getting a driver’s license is an exciting time for teens, but worrisome for concerned parents like you.

Explanation:

3 0

3 years ago

A sinusoidal wave of frequency 420 Hz has a speed of 310 m/s. (a) How far apart are two points that differ in phase by π/8 rad?

Olin [163]

Answer:

a) Two points that differ in phase by π/8 rad are 0.0461 m apart.

b) The phase difference between two displacements at a certain point at times 1.6 ms apart is 4π/3.

Explanation:

f = 420 Hz, v = 310 m/s, λ = wavelength = ?

v = fλ

λ = v/f = 310/420 = 0.738 m

T = periodic time of the wave = 1/420 = 0.00238 s = 0.0024 s = 2.4 ms

a) Two points that differ in phase by π/8 rad

In terms of the wavelength of the wave, this is equivalent to [(π/8)/2π] fraction of a wavelength,

[(π/8)/2π] = 1/16 of a wavelength = (1/16) × 0.738 = 0.0461 m

b) two displacements at times 1.6 ms apart.

In terms of periodic time, 1.6ms is (1.6/2.4) fraction of the periodic time.

1.6/2.4 = 2/3.

This means those two points are 2/3 fraction of a periodic time away from each other.

1 complete wave = 2π rad

Points 2/3 fraction of a wave from each other will have a phase difference of 2/3 × 2π = 4π/3.

8 0

4 years ago