1.A cyclist comes to the top of a hill 165 metres long trave

jerry8401272022-10-04 11:39:541条回答

1.A cyclist comes to the top of a hill 165 metres long travelling at 5 ms(-1次方),and free-wheels down it with an acceleration of 0.8ms(-2次方).Write expressions for his speed and the distance he has travelled after t seconds.Hence find how long he takes to reach the bottom of the hill,and how fast he is then travelling.
2.A freight train 1/4 KM long takes 20 seconds to pass a signal.The train is decelerating at a constant rate,and by the time the rear truck has passed the signal it is moving 10 kilometres per hour slower than it was when the front of the train passed the signal.Find the deceleration in kilometre-hour units,and the speed at which the train is moving when the rear truck has just passed the signal.
3.A cyclist is free-wheeling down a long straight hill.The times between passing successive kilometre posts are 100 seconds and 80 seconds.Assuming his acceleration is constant,find this acceleration.

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爱你我已失去你共回答了23个问题 | 采纳率100%: 1. Let v represent the cyclist's speed, and d the distance the cyclist has travelled. Then v = 5 + 0.8t, and d = 5t + 0.4t^2. Here d = 165, and we solve that t = 15, and v = 14.
2. Let a denote the deceleration of the train. Let v denote the initial velocity of the train. Then we have v*20 - 0.5*a*20^2 = 0.25 (1), and v - 20*a = v - 10 (2). Solving equations (1) and (2), we get a = 0.5, v = 0.5125.
3. Let a denote the cyclist's acceleration. Let v denote his initial velocity. We have the following: 100*v + 0.5*a*100^2 = 1000 (1), 80*(v + 100*a) + 0.5*a*80^2 = 1000 (2). Solving equations (1) and (2), we get a = 0.03, v = 8.61.; 1年前

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C.
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我先翻译一下题目：
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上山重力做负功,摩擦力做负功,人做正功.
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英语翻译1裁判把奖金颁给赢得比赛的自行车选手,并向他祝贺.（judge,congratulation,cyclist)2
英语翻译
1裁判把奖金颁给赢得比赛的自行车选手,并向他祝贺.（judge,congratulation,cyclist)2那本书的标题是：“葬身海底的船只”（title,bury,buttom)3被困在煤矿里两天的矿工们最后得到了营救.（mine,miner,rescue)4记者意识到女孩很害怕,而且尽力的回避问题.（repoter,frightened)5大火摧毁了离这儿四个街区的两个商店.（destroy,block)6气球突然***,我们大吃一惊.（burst,shock)7我无法表达我现在的感觉.（express)8他拒绝谈起那场灾难带给他的痛苦（suffering,disaster)9每天早上起床,他都会快速浏览一下报纸上的新闻标题.（wake up,headline)

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记者意识到女孩很害怕,而且尽力地回避问题（reporter；frightened）
大火摧毁了离这儿四个街区的两个商店.（destroy；block）
他拒绝谈起那场灾难带给他的痛苦.（suffering；disaster）
翻译如下：
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3.The reporter perceived that the girl who copped out by ducking the issue at her full steam was frightened.
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英语翻译
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8.他拒绝谈起那场灾难带给他的痛苦.（suffering;disaster）
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