问题 选择题

如图所示,为甲、乙二人在同一实验室同时做单摆简谐振动的振动图像,在实验误差范围内,从图像可以知道:( )

A.两个摆球的摆长一定不相等

B.两个摆球在平衡位置的速率一定相等

C.甲单摆的振动方程为cm

D.两个单摆不同相,甲比乙超前π/2

答案

答案:D

题目分析:根据振动图象甲的振动周期为4s,一定振动周期也为4s,即说明摆长相等,A错。由于摆幅甲大,说明机械能大,即在最低点甲的速度大于乙的速度,B错。根据简谐振动图像则数学函数为,所以C错。两个单摆不同相,甲比乙超前π/2,即答案为D

点评:本题考查了简谐振动的理解和方程的表达式。

单项选择题
阅读理解

Audrey Hepburn(奥黛丽·赫本)won an Academy Award as Best Actress for her first major American movie, Roman Holiday, which was released in 1953,But she is remem bered as much for her aid work as for her acting.

Born in Belgium in 1929, Audrey’s father was British and her mother was Dutch, Audrey was sent to live at a British school for part of her childhood , During World war ll , she lived and studied in the Netherlands , Her mother thought it would be safe from German attacks ,Audrey studied dance as a teenager and during college when she returned to London after the war, But she realized she wasn’t going to be a ballerina(芭蕾舞女演员),So she began taking acting parts in stage shows, Later she began to get small parts in movies.

But it was Audrey Hepburn’s move to America that brought her true fame ,In 1951 she played the character“Gigi”in the Broadway play of the same name to great critical praise, Two years later, Roman Holiday made her a star at the age of 24.

Audrey make more than 25 movies, Among her most popular roles was Hoolly Golinghtly in Breakfast at Tiffany’s in 1961, There years later she played Eliza Doolittle in my Fair Lady.

She was married two times and had one by each husband, In 1989,the UN Children’s Fund named Audrey a goodwill ambassador, She travelled all over the world in support of UNICEF(联合国儿童基金会) projects ,The UN agency said she was a tireless worker, She often gave 15 interviews a day to gain money and support for UNICEF projects.

Audrey Hepburn often said her loyalty to UNICEF was the result of her experiences as a child during World War II, She said she knew what it was like to be starving and to be saved by international aid , She was a goodwill ambassador until her death in 1993 from colon cancer.

小题1:In Paragraph 1,“her aid work”means       .

A.winning an Academy Award as Best Actress

B.taking acting parts in stage shows

C.making her own movies

D.acting as a goodwill ambassador for UNICEF小题2:The reason why Audrey lived and studied in the Netherlands was that     .

A.she wanted to be a ballerina

B.her parents were from Britain

C.it was safe there

D.the education there was excellent小题3:We can infer from the passage that     .

A.Audrey’s parents lived in Germany during World War II

B.Audrey lived in America in the 1950s

C.Audrey was made to give up dancing

D.the character“Gigi”in the Broadway play was her most popular role小题4:     is NOT mentioned in the passage about Audrey Hepburn

A.Marriage

B.Identity

C.Contribution

D.Religion小题5:     is the right order for Audrey’s life.

①The first time she began to play in movies

②She returned to London from the Netherlands

③She won an Academy Award as Best Actress

④She travelled all over the world in support of UNICEF projects

⑤She played a part in My Fair Lady

A.②①③⑤④

B.①②③⑤④

C.②①⑤③④

D.①②⑤③④