Water that is "hard" <span>contains a certain amount of dissolved minerals (like calcium and magnesium).
</span>Water that is "soft" <span>is a certain type of treated </span>water. It contains <span>only one type of ion, which is sodium. An example of this is rainwater because it is naturally </span>soft water.
Answer:
Molecules are made up of atoms that are held together by chemical bonds. These bonds form as a result of the sharing or exchange of electrons among atoms. The atoms of certain elements readily bond with other atoms to form molecules. ... The element helium is a one-atom molecule. I hope this helps :)
Answer:
(-1.5,-1.5)m
Explanation:
we know that:
where 
is the location of the center of gravity in the axis x, 
is the mass of the object i and 
the first coordinate of center of gravity of object i.
so:
Where 
is the first coordinate of the center of gravity for the fourth object.
Therefore, solving for , we get:
At the same way:
where 
is the location of the center of gravity in the axis y, is the mass of the object i and 
the second coordinate of center of gravity of object i. replacing values we get:
Where 
is the second coordinate of the center of gravity for the fourth object.
solving for :
It means that the object of mass 8kg have to be placed in the
coordinates (-1.5,-1.5) m.
Answer: For number 9, the children would not be able to close the box.
Explanation: The combined force of the children is 55 N. The box spring overpowers them with 60 N. I hope this helps!
