A10 ft chain weighs 45 lb and hangs from a ceiling. find the work done (in ft-lb) in lifting the lower end of the chain to the ceiling so that it's level with the upper end. ft-lb.

work done = 14478ft²-lb/s²

Step-by-step explanation: The work done is equal to the rest energy of the chain.

The rest energy is also the potential energy Mass* hieght*acceleration due to gravity.

But in this case we have to look for our acceleration due to gravity in ft/s².

I googled it an I got 32.174ft/s²

So now let's substitute

Work done = m*g*h

= 45*32.174*10=14478ft²lb/s².

i believe the correct answer is option 4.principalities were small territories that were run by russian rulers.

which statement correctly defines principalities in northern asia in the 1200s? principalities were small territories that were run by russian rulers.

hope i could ! : )

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step-by-step explanation: