继续英语物理题A lunar landing craft(mass=11400kg) is about to touch down on the surface of the moon,where the acceleration due to gravity is 1.6 m/s*2.At an altitude of 165m,the craft's downward velocity is 18.0 m/s.To slow down the craft,a re

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继续英语物理题A lunar landing craft(mass=11400kg) is about to touch down on the surface of the moon,where the acceleration due to gravity is 1.6 m/s*2.At an altitude of 165m,the craft's downward velocity is 18.0 m/s.To slow down the craft,a re

继续英语物理题A lunar landing craft(mass=11400kg) is about to touch down on the surface of the moon,where the acceleration due to gravity is 1.6 m/s*2.At an altitude of 165m,the craft's downward velocity is 18.0 m/s.To slow down the craft,a re
继续英语物理题
A lunar landing craft(mass=11400kg) is about to touch down on the surface of the moon,where the acceleration due to gravity is 1.6 m/s*2.At an altitude of 165m,the craft's downward velocity is 18.0 m/s.To slow down the craft,a retrorocker is firing to provide an upward thrust.
Assuming the descent is vertical,find the magnitude of the thrust needed to reduce the velocity to zero at the instant when the craft touches the lunar surface

继续英语物理题A lunar landing craft(mass=11400kg) is about to touch down on the surface of the moon,where the acceleration due to gravity is 1.6 m/s*2.At an altitude of 165m,the craft's downward velocity is 18.0 m/s.To slow down the craft,a re
题目要求当落地时速度恰好为0时其牵引力.可以将这个过程反过来看,看成把一个停止在月球表面上的物体加速到离月球165m时其速度为18m/s的时候,其牵引力为多少,这样就简单多了.
由题,初速度为0的物体,其匀加速直线运动的总距离s=0.5v^2/a.
所以带入上面的数据,得到a=0.5v^2/s=0.982(m/s^2)
而由牛二定律,ma=F-mg,其中月球的g=1.6.
所以F=ma+mg=11400×(0.982+1.6)=29435(N)

这个题目我大致明白了 就是要到月亮的表面时速度减少为0时的推力至少多大
其实也不难 这个飞行器的质量是11400 引力(也就是月球的重力加速度是1.6) 那么重力是11400*1.6 然后你假设推理为f 合力就是f-11400*1.6 然后除以质量m就就是加速度a了.假设到表面正好是0了,应该有 2*a*165=18*18 把a求出来后f也就出来了 明白了吗...

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这个题目我大致明白了 就是要到月亮的表面时速度减少为0时的推力至少多大
其实也不难 这个飞行器的质量是11400 引力(也就是月球的重力加速度是1.6) 那么重力是11400*1.6 然后你假设推理为f 合力就是f-11400*1.6 然后除以质量m就就是加速度a了.假设到表面正好是0了,应该有 2*a*165=18*18 把a求出来后f也就出来了 明白了吗

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继续英语物理题A lunar landing craft(mass=11400kg) is about to touch down on the surface of the moon,where the acceleration due to gravity is 1.6 m/s*2.At an altitude of 165m,the craft's downward velocity is 18.0 m/s.To slow down the craft,a re 英语物理题 东财10春学期《大学英语2》在线作业14.The house _____ beside the lake.A.restedB.reposedC.satD.stood满分：4 分15.The seventh day of the seventh lunar month is the only Chinese festival devoted _____ love in the Lunar calendar.A.atB.to 小F这里有英语题目很是困惑,嘻嘻 嗯 答的好的话会加财富值的!The Lunar New Year is always a happy time( ).A for us Chinese childrenB for we Chinese children 英语物理题,第一题a,b两问 大年初二用英语怎么说是不是用lunar 具体怎么说不会 英语小作文,春节Spring Festival 提示单词lunar calendar 放鞭炮 亲人 pin mon 15th of the 1st lunar month 用英语表示日子的名称? 帮忙写篇英语短文、简单介绍中国的农历新年要点：春节是中国人的重要节日；春节是在哪一天（农历：the lunar calendar）；除夕一家人吃团员饭（ have a...feast ）；大年初一亲朋好友拜年；孩 一篇中秋节英语作文,一般现在时,用上一两句定语从句或状语从句80~100字,用上以下几个词 August 15 of the lunar years...moon cakes...traditional...get together...enjoy the moon light ...a long history It is on the first day of a year on the lunar calendar怎么翻译 The Dragon Boat Festival is on()fifth day of ()fifth lunar month of a year It's the ___ day of the lunar year.(A.last B.second C.first) The Chinese calendar is based on a combination of lunar and solar movements. AP物理题,英语学霸快来, 继续用英语怎么说 “继续”用英语怎么说? 继续61.62英语