两个英文物理题1.An elevator under repair is descending at constant

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/14 16:17:19

两个英文物理题
1.An elevator under repair is descending at constant speed.At the moment it passes the mechanic,he drops his wrench.The wrench hits the elevator after 1,4second.What is the speed of the elevator?What is the speed of the wrench at the moment of hitting?
2.For a freely falling body,what is the ratio of the time needed to cover the first half of the distance and the time needed to cover the second half of the distance?

第一道题不是很明白是什么情景
觉得缺条件
第二道问的是自由下落的物体在前半路程和后半路程所用的时间比是多少
画图比较直观
答案应该是1/(√2 - 1)

两个英文物理题1.An elevator under repair is descending at constant 1.An elevator under repair is descending at constant speed.A 英文的物理题 When the temperature is constant.the pressure of a gi My bike is under repair.sth.be under repair是不是固定结构? The car is under repair.为何不是repairs? roof is under repair请教under在句中起什么作用?而为什么repair不用动名词形式表示正在进行呢 under repair的意思 matlab When a metal sphere at constant initialtemperature is The car is in repair.和 The car is under repair.意思相同吗?若不同,谢 the man is skilled at repair the machine? 英语翻译A bolt comes loose from underneath an elevator that is m A woman is waiting for( )elevator with a baby A.an B.the .为什