英语翻译You are planning to build a log cabin and will need to p

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英语翻译
You are planning to build a log cabin and will need to pull the logs up a hill
to the building site by means of a rope attached to a winch.In order to buy the
rope,you need to know how strong the rope must be and decide to do a quick
calculation for this.The logs weigh 500 lbs.at most and the hill is at an
angle of 30° with respect to the horizontal.You estimate that the coefficient
of kinetic friction between a log and the hill is 0.90.When pulling a log up
the hill,you will make sure that the rope stays parallel to the surface of the
hill and the acceleration of the log is never more than 0.80 m/s
2.

你计划建一所木屋,需要把原木用卷扬机（绞盘加绳子）把他们拖到山上的房基地.为了买绳子,你需要知道绳子要有多结实并想快速计算出来,原木最多重500磅,山坡同水平成30度角.你估计原木和山坡间的摩擦系数是0.9,当向上拉原木时,保证原木和山坡表面保持平行,原木的加速度不超过0.80米/秒^2

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