Number three
They contain protons (positive), neutrons (negative), electrons (neutral) and all are in a nucleus which is part of an atom
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B. The Particles Have Less Kinetic Energy than those of..
To solve the problem it is necessary to apply the definition of Newton's second Law and the definition of density.
Density means the relationship between volume and mass:
While Newton's second law expresses that force is given by
F = ma
Where,
m = mass
a= acceleration (gravity at this case)
In the case of the given data we have to,
In equilibrium, the entire system is equal to zero, therefore
Where,
Weight of balloon
Weight of helium gas
Bouyant force
Then we have,
Replacing the values we have that
Now by ideal gas law we have that
But the relation \frac{n}{m} is equal to the inverse of molar mass, that is
Therefore the pressure of the helium gas assuming it is ideal is 0.61Mpa
Answer:
over harvesting, pollution, introduction of invasive species such as new predators and food competitors
Explanation:
The main cause of mass extinction is Humans cause extinction of a species through overharvesting. The second main cause is pollution ., introduction of invasive species such as new predators and food competitors, habitat destruction, overhunting and other influences. Another very important cause of mass extinction is the unsustainable human population growth.
The five mass extinction events are
Ordovician Mass Extinction
Devonian Mass Extinction
Permian Mass Extinction
Triassic -Jurassic Mass Extinction
and Cretaceous -Tertiary (or the K-T) Mass Extinction.
