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Ray Of Light [21]
2 years ago
15

Which method is used to deliver heat in most central heating systems?

Physics
2 answers:
Wewaii [24]2 years ago
5 0
Theu use convection currents to blow the air aroubd the house
inessss [21]2 years ago
4 0
The right  answer is B. hope this helps you :)
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A spring is characterized by a spring constant of 60 N/m. How much potential energy does it store, when stretched by 1.0 cm?
Anestetic [448]

Answer:

3.0 x10^-3 J

Explanation:

The potential energy of a spring is given by PE = (0.5)k*x^2  

Where

K: Spring Constant = 60 N/m

x: displacement of the spring from its equilibrium position = 1cm = 0.01m

Then PE = 0.5(60)(.01)^2 = 0.003J = 3.0 x10^-3 J

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3 years ago
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KiRa [710]

Answer:

In the air

Explanation:

There are three states of matter:

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- Liquids: in liquids, particles are more free to move, however there are still some intermolecular forces keeping them close to each other

- Gases: in gases, particles are completely free to move, as the intermolecular forces between them are negligible

For this reason, it is generally easier to compress/expand the volume of a gas with respect to the volume of a liquid.

In this problem, we are comparing water (which is a liquid) with air (which is a gas). From what we said above, this means that the change in volume is larger in the air rather than in the water.

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Two waves overlap producing a new wave that exhibits destructive
suter [353]

Answer:B

Explanation:

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Answer:

last one.Condution and convection are equzlly efficentmethods of heat transfer.

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