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3 years ago

If a substance besides water is changed from a gas to a liquid and then to a solid, what happens to the particles?

Physics

2 answers:

Zarrin [17]3 years ago

6 0

Answer: they get closer together

Explanation:

NARA [144]3 years ago

3 0

The correct answer is they get closer together

Going from gas into a liquid makes the molecules move closer together, which happens again when you turn it into a solid.

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The self inductance relates the magnetic flux linkage to the current through the coil. Calculate the self inductance L in units

Katen [24]

Answer:

Self inductance, $L=127\ \mu H$

Explanation:

It is given that,

Length of the coil, l = 5 cm = 0.05 m

Area of cross section of the coil, $A=3\ cm^2=0.0003\ m^2$

Number of turns in the coil, N = 130

The self inductance relates the magnetic flux linkage to the current through the coil and it is given by :

$L=\dfrac{\mu_oN^2A}{l}$

$L=\dfrac{4\pi \times 10^{-7}\times (130)^2\times 0.0003}{0.05}$

L = 0.000127 Henry

$L=127\ \mu H$

So, the self inductance of the coil is 127 microhenry. Hence, this is the required solution.

6 0

4 years ago

Water evaporating from a pond does so as if it were diffusing across an air film 0.15 cm thick. The diffusion coefficient of wat

QveST [7]

Answer:

The water level will drop by about 1.24 cm in 1 day.

Explanation:

Here Mass flux of water vapour is given as

$j_{H_2O}=\frac{D}{l} \bigtriangleup c$

where

$j_{H_2O}$ is the mass flux of the water which is to be calculated.

D is diffusion coefficient which is given as $0.25 cm^2/s$

l is the thickness of the film which is 0.15 cm thick.
$\bigtriangleup c$ is given as

$\bigtriangleup c= \frac{P_{sat}-P_a}{RT}$

In this

$P_{sat}$ is the saturated water pressure, which is look up from the saturated water property at 20°C and 0.5 saturation given as 2.34 Pa

$P_a$ is the air pressure which is given as 0.5 times of $P_{sat}$

R is the universal gas constant as $8.314 kJ/kmol-K$

T is the temperature in Kelvin scale which is $20+273= 293K$

By substituting values in the equation

$\bigtriangleup c= \frac{P_{sat}-P_a}{RT} \\ \bigtriangleup c= \frac{P_{sat}-0.5P_{sat}}{RT} \\ \bigtriangleup c= \frac{0.5P_{sat}}{RT} \\ \bigtriangleup c= \frac{0.5 \times 2.34}{8.314 \times 293} \\\bigtriangleup c= 0.48 mol/m^3$