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2 years ago

Where does a phase change occur

Physics

2 answers:

natta225 [31]2 years ago

8 0

Answer:

Explained

Explanation:

Phase change is a physical process in which a substance goes from one phase to another. Usually changes occur at a constant temperature and at this constant temperature heat is either given or extracted from the object. And the nature of phase change depends upon the direction of heat transfer.

heat going into the system changes a solid into gas or liquid, whereas heat coming out of the system changes gases to liquid and liquids to solids.

il63 [147K]2 years ago

3 0

A phase change is occuring; the liquid water is changing to gaseous water, or steam. On a molecular level, the intermolecular forces between the water molecules are decreasing. The heat is providing enough energy for the water molecules to overcome these attractive forces.

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EMERGENCY! PLEASE HELP!

hichkok12 [17]

Answer: Volume = 1080m^3

Explanation:

Given that the prism has a 15 m by 18 m rectangular base and a height of 4 m

Volume is the product of length, breath and height. That is

Volume = L × B × H

Where

L = 18 m

B = 15m

H = 4m

Using the formula above gives:

Volume V = 18 × 15 × 4

V = 1080 m^3

8 0

3 years ago

A parallel-plate capacitor is connected to a battery. After it becomes charged, the capacitor is disconnected from the battery a

Inessa [10]

Answer:

The potential difference between the plates increases

Explanation:

As we know that the capacitance of the capacitor is given by:

$q = CV$ (1)

where

q = charge

C = capacitance

V = Voltage or Potential Difference

Also, the capacitance of a parallel plate capacitor is given as:

$C = \frac{\epsilon_{o}A}{D}$ (2)

where

$\epsilon_{o} = permittivity of free space or vacuum$

A = Area of the plates

D = Separation distance between the plates

Now, from eqn (1) and (2):

$V = \frac{qD}{A\epsilon_{o}}$

Now, from the above eqn we can say that:

Potential difference depends directly on the separation distance between the plates of the capacitor and is inversely dependent on the area of the plates of the capacitor.

Therefore, after disconnecting, if the separation between the plates is increased the potential difference across it also increases.

4 0

3 years ago

Warm air is more dense than cool air. Warm air is less dense than cool air Warm air and cool air have the same density

Wewaii [24]

Answer:

You are exactly right. The molecules in hot air are moving faster than the molecules in cold air. Because of this, the molecules in hot air tend to be further apart on average, giving hot air a lower density. That means, for the same volume of air, hot air has fewer molecules and so it weighs less

7 0

2 years ago

A block slides down a frictionless inclined ramp. If the ramp angle is 17.0° and its length is 30.0 m, find the speed of the blo

shutvik [7]

Answer:

v = 17.15 m/s

Explanation:

given,

angle of ramp = 17.0°

length of ramp(l) = 30 m

height of the ramp =

$h = l sin \theta$

$h = 30 sin 30^0$

h = 15 m

using energy of conservation

$\dfrac{1}{2}mv^2 = mgh$

$\dfrac{1}{2}v^2 = gh$

$v = \sqrt{2gh}$

$v = \sqrt{2\times 9.8\times 15}$

$v = \sqrt{294}$

v = 17.15 m/s

speed of block reaching at the bottom = v = 17.15 m/s

5 0

3 years ago

A 7.59-m-tall container is filled to the brim, partway with mercury and the rest of the way with water. The container is open to

hoa [83]

Answer:

0.22 m

Explanation:

$P_{o}$ = Atmospheric pressure = 101325 Pa

$P$ = Pressure at the bottom = tex]2 P_{o}[/tex] = 2 (101325) = 202650 Pa

$h$ = height of the container = 7.59 m

$x$ = depth of the mercury

Pressure at the bottom = Atmospheric pressure + Pressure due to mercury + Pressure due to water

$P = P_{o} + \rho _{w} g (h - x) + \rho _{hg} g x\\2 P_{o} = P_{o} + \rho _{w} g (h - x) + \rho _{hg} g x\\P_{o} = \rho _{w} g (h - x) + \rho _{hg} g x\\101325 = (1000) (9.8) (7.59 - x) + (13600) (9.8) x\\x = 0.22 m$

5 0

3 years ago

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