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Item 1

The force pulling the moon toward Earth depends on the mass of the two bodies and which factor?

the distance between them

the location of their centers of mass

the speed they travel

the size of their orbits around the sun

I think it's the last one.

Explanation:

Because gravity is what makes our planets stay still and stops our planets from dropping and as they orbit around the sun that's what keeps the moon from bumping into earth. I hope this helps and makes sense.

the answer for sodium is 0.186

the answer for rubidium is 0.251

a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.