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.

this excerpt is taken from the book “we shall not be moved : the women’s factory strike of 1909 “ and is written by joan dash. it is the story of the great strike when almost 30thousand women working in factories in america formed a union to fight unsafe working conditions, long working hours and miserable wages.

question: which best states the author’s purpose for including this information in the text?

answer: to challenge the reader’s ideas about a historical event