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frez [133]
3 years ago
7

What color is the moon

Physics
2 answers:
Inessa [10]3 years ago
5 0
The color for the moon is gray because if you would look outside when it is dark you would see the moon cloor gray
Aneli [31]3 years ago
5 0

The moon's color is Gray. The gray color is from the surface of the Moon where it's mostly oxygen, silicon, magnesium, iron, calcium and aluminum. Usually, the lighter color rocks are called plagioclase feldspar, and the darker ones are called pyroxene.


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The electricity received at an electrical substation has a potential difference of 20,000 V. What should the ratio of the turns
iren2701 [21]

The turn ratio of the transformer is 40.

<h3 />

<h3>What is a transformer?</h3>

A transformer is an electrical device that is used to step up or step down voltage.

The formula for calculating the turns ratio of a transformer is given below.

<h3> Formula</h3>
  • a = V/v.......... Equation 1

Where:

  • V = Primary voltage
  • v = Secondary voltage
  • a = Turns ratio of the transformer

From the question,

Given:

  • V = 20000 V
  • v = 500 v

Substitute the values above into equation 1

  • a = 20000/500
  • a = 40.

Hence, The turn ratio of the transformer is 40.

Learn more about transformers here: brainly.com/question/6450076

7 0
2 years ago
I need help on this question!!!
Irina-Kira [14]
2500
--------=3125
0.8

This can be can be viewed as compression due to the direction of the arrows.
7 0
3 years ago
What happens if you add additional,solid NaCl after the maximum has been reached?
azamat
<span>it would bond to the phosphate 

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3 0
3 years ago
Read 2 more answers
Topographic maps represent an area's physical features by describing _____.
jasenka [17]
B is the answer.....
5 0
3 years ago
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A single insulated duct flow experiment using air operating at steady-state is performed in a lab. One measurement location (Sta
weqwewe [10]

Answer:

a) -0.0934 kJ/kg. K

b) The direction of flow is from right to left.

Explanation:

A free flow diagram of the horizontal insulated duct is as shown below.

NOW,

Let assume that the direction of flow is from left to right and consider the following relation for the entropy rate balance equation for a control volume as:

\frac{\sigma_{cv}}{m}= (s_2-s_1) \geq  0 \ \ \ -------> \ \ \ 1

Now; if the value for this relation is greater than zero; then we conclude that our assumption is correct.

If the value is less than zero; then we conclude that the assumption is wrong.

Then, the flow is said to be  in the opposite direction

Formula for the change in specific entropy can be calculated as:

s_2-s_1 = s^0(T_2) - s^0(T_1)-R \ In ( \frac{P_2}{P-1}) \ \ \  ------->  \ \ \ 2

where;

s_1, s_2 , s^0(T_2), s^0(T1) are specific entropies

R = universal gas constant

P_1 = pressure at location 1

P_2 = pressure at location 2

We obtain the specific properties of air at temperature at T_1 = (67°C + 273)K = 340 K from the table A-22 ( Ideal gas properties of air)

s^0(T1) = 1.8279 kJ/kg.K

We also obtain the specific properties of air at temperature T_2 = 22°C + 273) K = 295 K

From the table A- 22

s^0(T_2) = 1.68515 kJ/kg . K

R = \frac{8.314 kJ}{28.97 kg.K}

P_1 = 0.95 bar

P_2 = 0.8 bar

Now replacing our values  into equation (2) from above; we have;

s_2-s_1 = s^0(T_2) -s^0(T_1)-R \ In (\frac{P_2}{P_1} )

s_2-s_1 = 1.68515 -1.8279-\frac{8.314}{28.97}  \ In (\frac{0.8}{0.95} )

s_2-s_1 = 1.68515 -1.8279+ 0.0493

s_2-s_1 =-0.0934 \  kJ/kg.K

Equating our result to equation (1)

s_2-s_1 \geq 0\\-0.0934 \leq 0

Therefore , our assumption is wrong and the direction of flow is said to be from right to left.

We therefore conclude that the direction of flow is from right to left.

3 0
3 years ago
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