试题与答案

如图(a)所示,在光滑绝缘水平面的AB区域内存在水平向右的电场,电场强度E随时间

题型:问答题

题目:

如图(a)所示,在光滑绝缘水平面的AB区域内存在水平向右的电场,电场强度E随时间的变化如图(b)所示.不带电的绝缘小球P2静止在O点.t=0时,带正电的小球P1以速度v0从A点进入AB区域,随后与P2发生正碰后反弹,反弹速度大小是碰前的

2
3
倍,P1的质量为m1,带电量为q,P2的质量m2=5m1,A、O间距为L0,O、B间距L=
4L0
3
.已知
qE0
m1
=
202
3L0
,T=
L0
v0

(1)求碰撞后小球P1向左运动的最大距离及所需时间.

(2)讨论两球能否在OB区间内再次发生碰撞.

答案:

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I will always remember my mother’s last few days in this world.

On February 14th, 2000, my class went on a field trip to the beach. I had so much fun. When we returned to school, my teacher told me to go to the headmaster’s office. When I got into the office, I saw a police officer. Suddenly I realized something was wrong. The police officer told me what had happened and we went to pick my sister up. After that, we went to the hospital and waited. Time went slowly. Finally, we got to see our mother. It was terrible.

On the next day, the headmaster came and told my two teachers what had happened. I was taking a rest that day. I knew it had something to do with my mother. I kept thinking that she either died or had gotten better. How I wished that she had gotten better. When my teacher took me outside, my sister ran up to me. She started crying, "She’s gone. Teresa, mommy’s gone. She’s dead. " I couldn’t believe it. We jumped into the car and drove straight to the hospital. Most of my family were there. The silence was terrible. I knew I had to say goodbye.

Today when I look back, I still miss my mother very much, but I know that I will live. My mother was a p mother, who had the biggest heart. My mother was an angel walking on the earth. I will always remember her as living. When someone is asked who their hero is, they usually say someone famous, like Michael Jordan or Britney Spears. When someone asks me who my hero is, I tell them, my mother. My mother lives every day. That is what makes her at rue hero.

What did the headmaster tell the two teachers on the next day ().

A.Her mother had been very ill.

B.Her mother had been dead.

C.Her mother had gotten better.

D.Her sister came to see her.

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