好难得物理题!用绳拴住木棒的AB的A端,使木棒在竖直方向上静止不动·在悬点A端正下方有一点C距A端0.8m.若把绳轻轻剪

一个物理题,好难得,你们试试看吧!请看下面!
在一个沸腾的烧杯A中在放一个小点的装满水的烧杯b,烧杯a的杯壁与少烧杯B的杯壁不相接触,则无论加热多少时间,烧杯B中的水总是不沸腾.

一道好难得英语阅读啊
Each year Ben is glad when school is closed on Martin Luther King Jr.Day.Ben knows that this day honors an important man,but Ben does not feel connected to him.However,the small-world theory (理论) connects Ben to Dr.King.Ben’s mom (0) has a close friend,Amy (1).Amy’s uncle,Mark (2),once met and spoke to John Carter (3),the son of President Jimmy Carter (4).Jimmy Carter knew Dr.King (5).In a way,Ben is only “five people away” from Martin Luther King Jr.
The small-world theory says that everyone in the world is connected through a short chain (链条) of people they know.Another name of this chain is degrees of separation.Each degree is a step that separates a person from someone he or she does not know.There are zero degrees of separation between a person and the people he or she knows directly.This means that there are zero degrees between Ben and his mom.There is one degree of separation when just one person separates someone from a person he or she does not know.Ben knows his mom,but he hasn’t met her close friend Amy.Therefore,Ben is one degree away from Amy.As the chain continues,Amy’s uncle,Mark,is two degrees.John Carter is three degrees,and his father is four degrees.Dr.King is five degrees away from Ben.The theory says that there are no more than six degrees of separation between any two people in the world.
The small-world theory has a lot to do with math.The theory assumes (假定) that each person knows 100 people.Each one of those 100 people knows 50 different people.Each of those 50 people knows another 50 people,and so on.When someone continues the calculation to six degrees,it is like this:100 × 50 × 50 × 50 × 50 × 50 = 31.25 × 109.This number is greater than 31 billion (a billion = a thousand million).There are over 6 billion people in the world.These numbers show it is possible that six degrees of separation could include everyone in the world.
Does the small-world theory work?No one has ever proved it.Maybe the theory just invites people to think a little more about their places in the world.
8.Ben is two degrees away from __________.
A.Jimmy Carter B.John Carter C.Amy D.Mark
9.What is the meaning of “degrees of separation” in Paragraph
A.The chain to connect people.B.The relations between people.
C.The steps of knowing strangers.D.The separation between strangers.
10.What is the small-world theory mainly about?
A.How far Ben is away from Dr.King.B.How many people one can get to know.
C.How people are connected in the world.D.How the degrees of separation are set up.
11.We can learn from the article that _____________.
A.the small-world theory works
B.more research is needed to prove the theory
C.six degrees are needed to know the strangers
D.the writer’s purpose is to help people find out their places
至少我只会第一个题
最后一个我最无法明白

好难得题数学
椭圆b^2x^2+a^2y^2=a^2b^2,a大于b大于0,它的左焦点是F,AB两点分别是左顶点和上顶点,若F到直线AB的距离是b/7^（-1）,则椭圆的离心率是?

救命啊,好难得数学题啊,就是一题而已,第一问我是会的,第二,第三问,说说吧

我觉得这道题应该值200财富的
也就是最多财富的题啦
好吧谁答对了，这里加200，再在
也加200吧
其实有人回答了
现在只要第二问思路啦