work done by a variable forceIn a one-dimensional situation,a force given by F(x) = (2.2 − 0.61x2) N acts over a displacement from x = 0 m to x = 0.12 m.What work does the force perform?\x05 A spring,compressed 0.31 m from its equilibrium posit

The work can't_ all by himself.A、do b.did c.done d.be done the work _ by the time you get there.A.will have been done B.is done C.had been done D.would have done the work _ by the time you get there.A.will have been done B.is done C.had been done D.would have done Most of the work ___ done by him.A has B have C is D are the amount of work still done （ ） A in hand B by hand Most of the work was done by sister and（ ）A .me B.I work done to the system和work done by the system的区别 a month done work as a year the work is done by ___ .me 还是I 为什么 He wanted the work done by 7.00翻译下 Dangerous and hard work can be done by almost all the work in the factory is no longer done----A by hand B with hands C in hand Most of the farm work __________ by machines in the USA.A.is done B.are doneC.is doing The ratio of the work done by the machine ( C )the work done on it is called the efficiency of the machine.A against B with C to D for为什么选C? You have done well in the work._________ it.AYou have done well in the work._________ it.A As far as B Far fromC So far D By far此题为什么选B,请分析一下, 问个英语问题 The ratio of the work done by the machine问个英语问题The ratio of the work done by the machine ________ the work done on it is called the efficiency of the machine.A) against B) with C) to D) for if one pays by the amount of work done and not by the hour.done 在这里是什么用法 The work is well done ____.A.in a way B.on the way C.by the way D.in the way