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Angelina_Jolie [31]
3 years ago
8

Some lakes, such as the Great Salt Lake, accumulate soluble minerals such as salt. In those lakes, people find it much easier to

float than when they are in fresh water. Why is this the case?
Physics
2 answers:
olga55 [171]3 years ago
5 0
<span>The water with a lot of dissolved minerals and salts is much denser than fresh water. And with a higher density, that means that less water needs to be displaced in order to float. This difference in density can be the difference between barely floating on your back with your nose barely out of the water versus floating comfortably on your back with your entire face out of the water. For instance, fresh water at 25C has a density of 997 kg/m^3, whereas the water in the Great Salt Lake, depending upon the salinity ranges from 1035 kg/m^3 to 1200 kg/m^3. Or in simpler terms it can be about 4% to 20% denser than fresh water and you'll float 4% to 20% higher in the salt water.</span>
erastova [34]3 years ago
4 0

Answer:

B)  The salt water has a greater density than fresh water.

Explanation:

Took the test

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Two charged objects separated by some distance attract each other. If the charges on both objects are doubled with no change in
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Answer:

(a) The force between them quadruples

Explanation:

According to coulomb's law, initial force between the two charged objects is given as;

F_1=\frac{Kq_1q_2}{r^2}

where;

k is coulomb's constant

q₁ is the charge on the first object

q₂ is the charge on the second object

r is the distance between the two objects

When the charges on both objects are doubled, then;

q₁ = 2q₁

q₂ = 2q₂

Force between the two charged objects will become

F_2 = \frac{K2q_12q_2}{r^2} =  \frac{4Kq_1q_2}{r^2} = 4(\frac{Kq_1q_2}{r^2}) = 4F_1

Therefore, the force between them quadruples

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3 years ago
The chemical symbol for the element calcium is Ca. What would be the symbol representing calcium atoms that have lost two electr
Kazeer [188]

Answer:

ca^{2 + }

Explanation:

In all atoms, the number of protons = number of electrons, as a result the atom is neutral. Losing or gaining electrons will make the atom electrically charged and we call an electrically charged atom an ion.

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3 years ago
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A=Fh
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F - force
h - distance

F=mg
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so
A=mgh
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4.5 seconds you devoured 3240/720=4.5
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2 years ago
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