Answer:
Answer is Object 2 (which has a density of 1.9 g/cm³).
Explanation;
When object is floating, the weight of that object is less than the up thrust on it.
When an object fully submerged and floating, then the weight of that object is equal to the up thrust on it.
This is known as the Archemide's principle.
Both up thrust and weight depends on the density. Hence, if the density of the solution is high, then the up thrust also high. If the density high, the the weight of the object also high.
Hence, to sink the object in water, that object should be denser than water. Hence, answer is object 3 which has a higher density than water.
Explanation:
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YeS im Am fRom pLanet k12 And brinG anD imPortant MesSage </h2>
- The answer to your question is, <u><em>There are only so many ways matter can arrange itself within that infinite universe.</em></u>
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<em>Also if your on the same test as me heres some other sTuff that was on my test </em></h2><h2>
<em> </em></h2>
Question 1 (1 point)
In Brian Greene's "A Physicist Explains Why Parallel Universes May Exist", what reason does Greene give for why he believes parallel universes may exist?
- <em>Answer: There are only so many ways matter can arrange itself within that infinite universe.</em>
<em> </em>
Question 2 (1 point)
Choose the best explanation for why we experience the Mandela Effect.
- <em>Answer: Our brains tend to fill in information that we cannot readily recall and make associations that are not true.</em>
Question 3 (1 point)
From the article "Time Travel Is A Fun Science Fiction Story But Could It Be Real?", Albert Einstein's Theory of Relativity is described as what?
- <em>Answer: The pulling force of gravity causes space to curve and causes time to slow down.</em>
Question 4 (1 point)
From the video " Are Wormholes The Answer To Time Travel?", how are worm holes described?
- <em>Answer: A tunnel in space connecting two regions very distant from each other. A "short cut" through space</em>
Question 5 (1 point)
Many scientists think human cloning is possible, so why haven't we made human clones yet?
- <em>Answer: Human cloning is extremely controversial and many people believe it is unethical</em>
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HOPE THIS HELPS ANYONE IF IT DOES THANK AND RATE FOR A FREE COOKIE :D
</em></h2>
Answer:
Boiling point of the solution is 100.78°C
Explanation:
This is about colligative properties.
First of all, we need to calculate molality from the freezing point depression.
ΔT = Kf . m . i
As the solute is nonelectrolyte, i = 1
0°C - (-2.79°C) = 1.86 °C/m . m . 1
2.79°C / 1.86 m/°C = 1.5 m
Now, we go to the boiling point elevation
ΔT = Kb . m . i
Final T° - 100°C = 0.52 °C/m . 1.5m . 1
Final T° = 0.52 °C/m . 1.5m . 1 + 100°C → 100.78°C
Answer: Mass of
required to form 930 kg of iron is 1328 kg
Explanation:
To calculate the number of moles, we use the equation:
.....(1)
For iron:
Given mass of iron = 930 kg = 930000 g (1kg=1000g)
Molar mass of iron = 56 g/mol
Putting values in equation 1, we get:

The chemical equation for the production of iron follows:

By Stoichiometry of the reaction:
2 moles of iron are produced by = 1 mole of 
So, 16607 moles of iron will be produced by =
of 
Now, calculating the mass of
from equation 1, we get:
Mass of
= 
Thus mass of
required to form 930 kg of iron is 1328 kg