试题与答案

(10分)利用气垫导轨验证机械能守恒定律,实验装置示意图如图1所示: (1)实

题型:实验题

题目:

(10分)利用气垫导轨验证机械能守恒定律,实验装置示意图如图1所示:

      

(1)实验步骤:

①将气垫导轨放在水平桌面上,桌面高度不低于lm,将导轨调至水平;

②用游标卡尺测量挡光条的宽度L,结果如图2所示,由此读出L=           mm;

③由导轨标尺读出两光电门中心之间的距离S;

④将滑块移至光电门1左侧某处,待砝码静止不动时,释放滑块,要求砝码落地前挡光条已通过光电门2;

⑤从数字计时器(图1中未画出)上分别读出挡光条通过光电门1和光电门2所用的时间△t1和△t2

⑥用天平称出滑块和挡光条的总质量M,再称出托盘和砝码的总质量m.

(2)用表示直接测量量的字母写出下列所示物理量的表达式:

①当滑块通过光电门1和光电门2时,系统(包括滑块、挡光条、托盘和砝码)的总动能分别为Ek1=          和E k2=           

②在滑块从光电门1运动到光电门2的过程中,系统重力势能的减少量△EP=       (重力加速度为g).

(3)如果在实验误差允许的范围内,△EP=            ,则可认为验证了机械能守恒定律.

答案:

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The Black Crook, which opened at Niblo’s Garden in New York City on Sept. 12, 1866, is usually (6) as the inspiration for musical comedy. A troupe of French ballet dancers (7) to be stranded in New York without work (8) a fire damaged the theater (9) they had been booked. In order to keep a (10) to them, the theater producer put the dancers into a melodrama written by Charles M. Barres.

The first stage production that was (11) a musical comedy was a show that was (12) from the Prince of Wales Theater to the Gaiety Theater in London in 1892. Staged by George Edwards, the show called In Town featured a chorus line of Gaiety Girls. The (13) year A Gaiety Girl was equally successful, and a (14) of the show played in New York in the same year. When it was (15) in newspapers, it was designated a musical comedy and regarded as a new (16) of entertainment.

It did not take the form long to (17) in the United States. Almost (18) one of the most renowned talents of the American stage went to work on his own musicals. The singer-dancer George M. Cohan staged Little Johnny Jones in 1904. Cohan, (19) own life story was made into the musical George M (1968), also wrote the books, words, and (20) for Forty-five Minutes from Broadway ( 1906 ), The Little Millionaire ( 1911 ), The Song and Dance Man ( 1923 ), and American Born (1925).

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A.commitment

B.sense

C.communication

D.connection

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