A cable weighing 0.8 pounds per foot is attached to a small 80-pound robot,and then the robot is lowered into a 50-foot deep well to retrieve a 7 pound wrench.The robot gets out of the well (carrying the wrench) by climbing up the cable with one end

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A cable weighing 0.8 pounds per foot is attached to a small 80-pound robot,and then the robot is lowered into a 50-foot deep well to retrieve a 7 pound wrench.The robot gets out of the well (carrying the wrench) by climbing up the cable with one end
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A cable weighing 0.8 pounds per foot is attached to a small 80-pound robot,and then the robot is lowered into a 50-foot deep well to retrieve a 7 pound wrench.The robot gets out of the well (carrying the wrench) by climbing up the cable with one end
A cable weighing 0.8 pounds per foot is attached to a small 80-pound robot,and then the robot is lowered into a 50-foot deep well to retrieve a 7 pound wrench.The robot gets out of the well (carrying the wrench) by climbing up the cable with one end of the cable still attached to the robot.How much work does the robot do in climbing to the top of the well?
请看清楚哦，机器人是沿着绳子往上爬的，也就是说每时每刻它本身的重量在变化（绳子挂在它身上的部分随着它往上爬也在增加） 所以不是单纯的物理题目 我肯定是微积分的题目因为它就是在我书上这一个chapter的内容啊。

A cable weighing 0.8 pounds per foot is attached to a small 80-pound robot,and then the robot is lowered into a 50-foot deep well to retrieve a 7 pound wrench.The robot gets out of the well (carrying the wrench) by climbing up the cable with one end
为什么要用微积分?就是简单的做功问题吧?（80+7）*50,我们国内的物理教材上功的单位是牛·米,这里的单位是磅·英尺,必要的话换算下

A cable weighing 0.8 pounds per foot is attached to a small 80-pound robot,and then the robot is lowered into a 50-foot deep well to retrieve a 7 pound wrench.The robot gets out of the well (carrying the wrench) by climbing up the cable with one end cable CABLE cable A black hole weighing a billion tons ...这里用weighing 用weighs行不? take a bird view cable take a cable car 嘛意思 USB A Male to A Male Cable (2 Meter, 英语翻译a collecting tina packing casea weighing machinea bathing suita measuring tapedrinking water 610 帮看看英语作文有误语病The utility model relates to an automatic weighing device used for weighing various crops such as tobaccos, etc. The utility model comprises an outer case, a machine core and a weighing platform. The weighing plat 英语翻译这里面到底是光缆还是电缆啊?Some types of cable for two main ways of laying of cable are needed.1.A single-mode cable for surface laying of cable having a plastic rod (or a flexible steel cable) as a load-bearing element.Cable weighing charge是什么意思 weighing charge是什么意思 weighing controller是什么意思 weighing indicator什么意思 cable是什么意思? cable hangers cable是什么意思