一个物理题.帮帮,A hot air balloon decends toward the ground with a velocity of (2.0 m/s).A champagne bottle is opened to celebrate takeoff,expelling the cork horizontally with a velocity of (4.0 m/s) relative to the balloon.When opened,the bot

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一个物理题.帮帮,A hot air balloon decends toward the ground with a velocity of (2.0 m/s).A champagne bottle is opened to celebrate takeoff,expelling the cork horizontally with a velocity of (4.0 m/s) relative to the balloon.When opened,the bot

一个物理题.帮帮,A hot air balloon decends toward the ground with a velocity of (2.0 m/s).A champagne bottle is opened to celebrate takeoff,expelling the cork horizontally with a velocity of (4.0 m/s) relative to the balloon.When opened,the bot
一个物理题.帮帮,
A hot air balloon decends toward the ground with a velocity of (2.0 m/s).A champagne bottle is opened to celebrate takeoff,expelling the cork horizontally with a velocity of (4.0 m/s) relative to the balloon.When opened,the bottle is 6.2 m above the ground.(Neglect air resistance.)
1.What is the speed of the cork,and its initial direction of motion,as seen by the same observer?
2.Determine the maximum height above the ground attained by the cork.
3.How long does the cork remain in the air?
(2.0 m/s)y (4.0 m/s)x

一个物理题.帮帮,A hot air balloon decends toward the ground with a velocity of (2.0 m/s).A champagne bottle is opened to celebrate takeoff,expelling the cork horizontally with a velocity of (4.0 m/s) relative to the balloon.When opened,the bot
先是翻译,我想你应该就会做了（翻译错了就不是我的事了,本人英语不大好）
就是说热气球2m/s上升,在上升了6.2m的时候打开一瓶香槟,软木塞以4m/s的速度相对香槟水平飞出,求问：
1）软木相对地面的速度
2）软木离地最大高度
3）软木离地时间
附上题解
1）
就是普通的速度合成
v=4i+2j=2√5m/s,方向与水平面成tanθ=1/2
2）
斜抛运动,Vx=4m/s,Vy=2m/s,H0=6.2m
只考虑竖直方向
h=Vy²/2g=0.2m
H=H0+h=6.4m
3）
同样只考虑竖直方向
上升耗时t1=Vy/g=0.2s
下降耗时t2=√2H/g=0.8√2s
总耗时T=t1+t2=0.2+0.8√2 s
关于3）,如果还要计算在打开香槟之前的时间的话,那么要再加上t3=6.2/2 s=3.1s

一个物理题.帮帮,A hot air balloon decends toward the ground with a velocity of (2.0 m/s).A champagne bottle is opened to celebrate takeoff,expelling the cork horizontally with a velocity of (4.0 m/s) relative to the balloon.When opened,the bot It's ____ today.We have to turn the air condition.A.pretty hot B.a little hot rise like a hot-air balloon是什么意思? Without air to hold the sun's heat page 90Without air to hold the sun's heat,the earth can ____ ,too hot to live on.A would be burning hot B would be burnt hot fly in a hot air balloon什么意思 翻译：tell a story( ) hot air( ) come clean( )急! HOT AIR的意思 hot-air是什么意思 hot air引申义是什么 Some people love hot weather,whereas some people can't stand to be in A B the summer heat in casethey have an air conditioner .请问这道题哪错了 Summer here is hot and________(having a lot of wetness in the air ,and usually very hot). having a lot of wetness in the air,and usually very hot.翻译.. 英语高手请进回答几个简单的问题,说出为什么,答的好可加分．1.___(_b_)__,we turned on the air conditioner.a.The day was very hot b.The day being very hotc.It was a very hot day d.Being a very hot day 2.Most people think that we 英语首字母填空题目air is everywhere around us．hot air is very （l ）．and some early （b ）used hot air．you have seen hot （s ）rising overa fire．the hot air takes it up．some ballons carried the fires under them,then they took 帮帮我物理题 there is____in my office.A.air-conditionded B.air-conditioner C.an air-conditioner D.air-condition HOT AIR GUB翻译成中文 hot-air balloon的意思急