问题 填空题

如图,用甲乙图两种方法提起相同重的物体,则:

(1)机械效率高的是______图的办法.

(2)提高图乙机械效率的方法有:增加提升的物重和______.

答案

(1)由图可知,二者的有用功相同,但乙图是将动滑轮和重物一起拉上去,所以要克服动滑轮重做额外功,而甲图没有动滑轮,所以做得额外功少,所以甲图的机械效率高,乙图的机械效率低;

(2)提高机械效率的方法是减小额外功,增加有用功,所以采取的办法有:减轻动滑轮重、减小摩擦;用同一滑轮组提升更重的重物(在承受范围内)等.

故答案为:(1)甲;(2)减轻动滑轮重.

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第二节 信息匹配(共5小题;每小题2分,满分10分)

阅读下列应用文及相关信息,并按照要求匹配信息。

首先,请阅读以下有关音乐会的信息。

A.Raymond’s Solo Concert: Raymond, the talented singer who shifts freely between musical, folk songs and hip hop, is to give a solo concert this weekend. The event will be part of the Asian tour promoting his new album. His concert has very high ticket prices, but his fans have bought tickets worth one million yuan in just four days.

Place: Grand Theatre

Time: 8:30 – 10:30 pm, January 6

Price: 380 – 2,000 yuan

Tel: 7322-3411

B.Prince of the Piano: Clayderman has established a truly international career as a best selling recording artist and concert performer. He has recorded over 1,000 melodies and created a "New Romantic" style through a repertoire which combines his 'trademark' originals with classics and pop standards. In fact, despite his natural shyness and reserve, he is completely in his element on stage; a Richard Clayderman concert is a real 'Spectacular'.

Place: The Great Hall of the People

Time: 8:00 – 10:00 pm, January 7

Price: 180 – 1680 yuan

Tel: 7310-5266

C.Live Music: Audiences in the city will be able to make a date with one of the most famous German Orchestras on the evening of Jan. 27 at Century Center. Conducted by Florian Stubenvoll, the orchestra will perform 11 classics including Beethoven's "Fledermaus Ouverture," Mozart's "Symphony No. 40," and four pieces by Johann Strauss.

Place: Century Theatre

Time: 8:00 – 10:30 pm, January 10

Price: 120 – 680 yuan

Tel: 7988-7311

D.Jazz Night: Enjoy real American jazz from Herbie Brown, the famous trumpet player. He’s coming with his new 7–piece band, Herbie’s Heroes. Herbie is known to play well into the early hours, so don’t expect to get much sleep. This is Herbie’s third visit to China. The first two have been sold out, so get your tickets quickly.Place: The Jazz Club

Time: 10:00 pm till late! January 7, 9, 11

Price: 100 – 200 yuan,

Tel: 7599-7862

E. Scottish Dancing: Want to get your body some exercise while enjoying live music? Take your partner here and get ready to dance till you drop. Scottish dancing is fun and easy to learn. There will be instructors demonstrating the dances. The live band is also excellent.

Place: Jack Stein’s

Time: 7:30 – 10:00 pm, January 5 – 7

Price: 70 yuan including one drink

Tel: 7832-1788

F. Beijing Rocks: “The Night of Chinese Rock” is set to bring rock fans special performance. Eight Chinese rock bands will perform at the concert, including older generation bands, middle generation and some recent arrivals. The audience can even decide what songs they want to hear, which is sure to bring a storm.

Time: January 8, 9

Place: Worker’s Stadium

Time: 8:00 – 11:30 pm, January 4

Tel: 7633-0640

Price: 90 – 680 yuan

请阅读以下观众的信息,然后匹配与其适合的音乐会。

56. Mike and his girlfriend are both university students. The coming Sunday (January 6) is his girlfriend’s birthday. As both of them are music fans, Mike would like to take his girlfriend to enjoy some live music and learn something new.

57. Joey and his friends always enjoy their weekend by attending late night activities. However, he hasn’t joined them for a long time because he has been working for a couple of weeks. This weekend he wants to have some fun and excitement with his friends, who are interested in western music.

58. Alice is a college student who studies music, and playing the piano is her favorite. Her parents approve of her attending concerts and pay for the tickets. As a result, she doesn’t care much about how much the ticket might cost.

59. Tracy is interested in a variety of music. Like most of the other university students, she has a part-time job. She would like to amuse herself by attending concerts. Since she does not earn much, she can only afford a ticket that costs no more than 100 yuan.

60. Sally enjoys listening to foreign music in her spare time. She would like to attend concerts performed by foreign bands or orchestras whenever it’s possible. But according to the school rules, she has to return to her dormitory before 11:00 pm.