I'm not 100% sure, but I believe what you mean is when they eject the old propulsion motors. Yes, they land in the ocean and the US Navy retrieves them for later use.
Lubricant is a type of oil. It smoothes surfaces. Meaning anything rubbing against the other object wont produce enough heat, which is what creates friction. Its an ideal tool to use for a lot of things.
I hope this helps :)
We know that centripetal acceleration is nothing but the ratio of the square of the tangential velocity to that of the radius vector.
a=v*v/r=ωωrr/r
=ωωr
=2πf2πfr
=2π2πr/TT
=97m/secsec
-- water shooting out of a hose
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-- making hard-boiled eggs
-- driving to the dentist
-- the emission spectrum of a carbon arc
-- buying a new car
-- putting your shoes on
-- singing a song
-- cutting a tree down
-- learning to dance
-- cleaning the windows
-- building a radio
-- ironing your shirt
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-- playing the piano
