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4 years ago

NEED ANSWER FAST PLZ

Physics

2 answers:

Kryger [21]4 years ago

7 0

A. liquid and vapor in a confined area

DIA [1.3K]4 years ago

6 0

Answer:

Option (B)

Explanation:

The latent heat is often defined as the amount of temperature that is needed in the conversion of a phase, such as from solid to liquid (or gas) or from liquid to gas, and during this entire process, the temperature remains constant.

This latent heat plays an important role in generating intensive thunderstorms as well as hurricanes because it acts as a source of energy.

There are two types of latent heat and they are as follows-

(1) Latent heat of fusion- This involves a phase change from solid to liquid.

(2) Latent heat of vaporization- This involves a phase transformation from liquid to gas.

Thus, the correct answer is option (B).

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Determine the COP of a heat pump that supplies energyto a house at a rate of 8000 kJ/h for each kW of electric power it draws. A

Anna11 [10]

The rate of energy absorption from the outdoor air is 4400 KJ/h

Explanation:

Coefficient of performance (COP), is an expression of the efficiency of a heat pump. When calculating the COP for a heat pump, the heat output from the condenser (Q) is compared to the power supplied to the compressor (W).

The coefficient of performance, $C O P=\frac{Q_{H}}{W_{i n}}$

We replace the value in the equation with given data,

$C O P=\frac{(8000 K J / h)}{1 K W}=8000 K J / h$

By making a conversion, we get

$C O P=\frac{(8000 \mathrm{KJ} / \mathrm{h})}{1 \mathrm{KW}} \times \frac{(1 \mathrm{KW})}{3600}=2.22$

The energy balance, $Q_{L}=Q_{H}-W_{i n}$

Now, replace the values in the equation, we get

$Q_{L}=(8000 \mathrm{KJ} / \mathrm{h})-(3600 \mathrm{KJ} / \mathrm{h})=4400 \mathrm{KJ} / \mathrm{h}$

8 0

3 years ago

What experimental evidence supports the idea that conducting materials have freely moving electrically charged particles inside

zalisa [80]

Answer:

Layer of glass rod rubbed with silk.

Explanation:

Some of the atoms in the surface layer of a glass rod positively charged by rubbing it with a silk cloth have lost electrons, leaving a net positive charge because of the unneutralized protons of their nuclei. A negatively charged object has an excess of electrons on its surface.

4 0

3 years ago

Find the wavelength (in nm) of a 2.52 eV photon. a. 492.34127 nm.b. 585.88611 nm.c. 541.5754 nm.d. 418.49008 nm.

elena-14-01-66 [18.8K]

Answer:

The correct option is (a).

Explanation:

Given that,

The energy of photon, E = 2.52 eV

We need to find the wavelength of the photon in nm. The formula for the energy of a photon is given by :

$E=\dfrac{hc}{\lambda}\\\\\lambda=\dfrac{hc}{E}\\\\\lambda=\dfrac{6.63\times 10^{-34}\times 3\times 10^8}{2.52\times 1.6\times 10^{-19}}\\\\=4.93\times 10^{-7}\ m\\\\=493\ nm$

The nearest option is a) i.e. 492.34127 nm.

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3 years ago

What is the model size to actual size

Murljashka [212]

Answer:

You have to divide your real measurement to the model. For example, if your real measurement is 5m and your model is 20cm, divide 5/20 =1/4 and that means the ratio would be 1:4.

Explanation:

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3 years ago

Average velocity can be calculated by dividing displacement over what? NVM its change in time

dsp73

The average speed of an object is defined as the distance traveled divided by the time elapsed. Velocity is a vector quantity, and average velocity can be defined as the displacement divided by the time. Hope this answers the question. Have a nice day.

6 0

3 years ago