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JulijaS [17]
3 years ago
13

What best explains why a wood burning fire place represents an open system

Physics
2 answers:
nikitadnepr [17]3 years ago
8 0

Answer:

Because it is open to more wood being burned and it is giving smoke out

Explanation:

Sedaia [141]3 years ago
3 0

Smoke and hot gases leave the system through the chimney, and this draws new air into the system from surrounding parts of the galaxy that are outside the system.

So a fireplace that's turned on is open at both the input and the output.

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the mass of a brick is 4 kg, find the mass of water displaced by it when completely immersed in water.​
vova2212 [387]

Answer:

The correct answer is = 1.6

Explanation:

Density of water = 1000kg/m³ = d₁

Mass of brick = 4kg = m

Density of brick = 2.5 g/cm³ = 2.5 × 1000 =2500 kg/m³ = d₂

Volume of brick = m/d₂ = 4/2500 =16/10000 = 0.0016 L = v

Buoyant Force = v × d₁ × g          (g= acceleration due to gravity =9.8m/s²)

= 0.0016 × 1000 × 9.8 = 15.68 Newtons

By the Archimedes' Principle, the buoyant force is equal to the weight of the liquid displaced by an object.

Weight of the water displaced=Buoyant Force

=Mass of water displaced × g,

as weight = mass × acceleration due to gravity

15.68= mass of brick × 9.8

15.68/9.8 =Mass of water displaced

1.6 kg = Mass of water displaced

4 0
3 years ago
Nutritionists use the ______ to measure how much energy we get from foods.
Natali [406]
<span>It is measured in calories </span>
6 0
3 years ago
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Describe the agronomic significance of the upper and lower plastic limits, and of the plasticity index?​
GarryVolchara [31]

Answer:It shows the size of the range of the moisture contents at which the soil remains plastic. In general, the plasticity index depends only on the amount of clay present. It indicates the fineness of the soil and its capacity to change shape without altering its volume.

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Plastics are used in millions of objects we use every day. Why are plastics NOT considered natural resources?
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B

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Yes plastic is artficial

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