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miv72 [106K]
3 years ago
15

The technological challenges of installing cellphones across the globe

Physics
1 answer:
Leona [35]3 years ago
3 0

Answer:

I don't know sorry For this question

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Which of the following is not an air pollutant?
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Answer: 1. Carbon dioxide is not an air pollutant

Explanation: it can be toxic and or safe
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2 years ago
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A heat pump absorbs heat from the atmosphere at a rate of 30 kW. If work is being done to run this heat pump at a rate of 7.7 kW
Volgvan

Answer:

Option D 3.9

Explanation:

First, you need to use the correct equation which is the following:

COP = Q/W

Where:

Q = heat absorbed

W = work done by the pump

COP = coefficient of perfomance

We have all the data, so, all you need to do is replace in the above expression and you shoould get the correct result:

COP = 30 / 7.7

COP = 3.896

This result you can round it to 3.9. option D.

8 0
3 years ago
Jacques is trying to put a screw into a hard piece of wood, but it is too difficult for him to turn. Which of the following woul
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Answer:

A. It is the only one that makes sense

Explanation:

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4 years ago
A. Fill in the blanks in the following paragraph to correctly identify some
amid [387]

Answer:

1.) Liquid

2.) Low

3.) Molecular

4.) Surface tension

5.) Solvent

Explanation:

Water is important to living things because it remains in the LIQUID state over a wide range of temperatures. Water in lakes and oceans does

not experience large temperature changes because liquid water has a

LOW specific heat, so it must absorb or release a lot of energy as its temperature changes. The MOLECULAR forces between water

molecules cause water to form round droplets and cause water's high SURFACE TENSION. Water is also an important SOLVENT because it can

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7 0
4 years ago
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A crate is lifted vertically 1.5 m and then held at rest. The crate has weight 100 N (i.e., it is reese (enr647) – HS OnRamps 04
icang [17]

Answer:

W = 0 J

Explanation:

It is given that,

Weight of the crate, W = 100 N

Distance moved by the crate, d = 1.5 m

Let W is the work done to hold the crate 1.5 m above the ground in this way. It is given by the product of force and the displacement. Its formula is given by :

W=F\times d\times cos\theta

Here, \theta=90^{\circ} as it is lifted vertically

W=100\ N\times 1.5\ m\ cos(90)      

W = 0

So, the work done to hold the crate is 0. Hence, this is the required solution.

5 0
3 years ago
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