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vova2212 [387]
2 years ago
10

In the formula for water (H20), what does the lack of a subscript after the 0 indicate?

Physics
2 answers:
xz_007 [3.2K]2 years ago
5 0
The lack of a subscript after the 0 means that there is only one oxygen (0).

There are 2 hydrogen molecules and 1 oxygen molecules

hope this helps
xz_007 [3.2K]2 years ago
5 0
The lack of a subscript on the O means there is only one oxygen atom in the water molecule/compound. 
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Also, the tissue inside of bones is bone marrow.

If you know that, you can take out those two options (Option 1 and 3)

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Give two examples of contact and non-contact forces and explain why they are contact and non-contact forces respectively.​
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The Two examples of contact forces are:

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The two examples of non contact forces are:

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Non Contact forces happens because there is no contact between two objects. There is no attraction.

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Ne4ueva [31]
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True or false as heat and pressure decreases one type of metamorphic rock will transform into another type
dezoksy [38]

Answer: True

Explanation:  Metamorphism is the changing of rocks by heat and pressure. During this process, rocks change either physically and/or chemically. They change so much that they become an entirely new rock. Figure 4.22: The platy layers in this large outcrop of metamorphic rock show the effects of pressure on rocks during metamorphism.

6 0
2 years ago
A Carnot heat engine uses a hot reservoir consisting of a large amount of boiling water and a cold reservoir consisting of a lar
kakasveta [241]

Answer:

W=4037.36\ J

Explanation:

Given:

mass of ice melted, m=3.3\times10^{-2}\ kg

time taken by the ice to melt, t=5\ min=300\ s

latent heat of the ice, L=3.34\times 10^5\ J

Now the heat rejected by the Carnot engine:

Q_R=m.L

Q_R=0.033\times 3.34\times 10^5

Q_R=11022\ J

Since we have boiling water as hot reservoir so:

T_H=373\ K

The cold reservoir is ice, so:

T_L=273\ K

Now the efficiency:

\eta=1-\frac{T_L}{T_H}

\eta=1-\frac{273}{373}

\eta=26.81\%

Now form the law of energy conservation:

Heat supplied:

Q_S-W=Q_R

where:

Q_S= heat supplied to the engine

Q_S-\eta\times Q_S=Q_R

Q_S(1-\eta)=Q_R

Q_S=\frac{11022}{1-0.2681}

Q_S=15059.36\ J

Now the work done:

W=Q_S-Q_R

W=15059.36-11022

W=4037.36\ J

8 0
3 years ago
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