问题 填空题

如图所示,杠杆质量不计,O为支点,每小格的长度相等。当A、B两物分别挂在杠杆两侧如图示位置时,杠杆在水平位置上平衡。A物质量是4千克,则B物的质量为________千克。如果将A、B两物的悬绳同时往里移动一格,则杠杆________(选填:“仍能”或“不能”)平衡。

答案

3 不能

题目分析:此杠杆动力和阻力分别为物体A、B对杠杆的作用力,A物对杠杆作用力的力臂为3格,B物对杠杆作用力的力臂为4格。根据杠杆平衡条件可以求出B的质量为3kg。如果将A、B两物的悬绳同时往里移动一格,则A物对杠杆作用力的力臂为2格,B物对杠杆作用力的力臂为3格,左边物体对杠杆的作用力和力臂的乘积较大,所以杠杆左端会下沉,杠杆不能保持平衡。

单项选择题
单项选择题

Vienna was one of the music centers of Europe during the classical period, and Haydn, Mozart, and Beethoven were all active there. As the (1) of the Holy Roman Empire (which included parts of present-day Austria, Germany, Italy, Hungary, Czech and Slovakia), it was a (2) cultural and commercial center (3) a cosmopolitan character. Its population of almost 250,000 (in 1800) made Vienna the fourth largest city in Europe. All three (4) masters were born elsewhere, but they were (5) to Vienna to study and to seek (6) . In Vienna, Haydn and Mozart became close friends and influenced each other’s musical (7) . Beethoven traveled to Vienna at sixteen to play for Mozart; at twenty-two, he returned to study with Haydn.

Aristocrats from all over the Empire spent the winter in Vienna, sometimes bringing their private (8) . Music was an important part of court life, and a good orchestra was a (9) of prestige. Many of the nobility were excellent musicians.

Much music was heard in (10) concerts where aristocrats and wealthy commoners played (11) professional musicians. Mozart and Beethoven often earned money by performing in these intimate concerts. The nobility (12) hired servants who could (13) as musicians. An advertisement in the Vienna Gazette of 1789 (14) : " Wanted, for a house of the gentry, a manservant who knows how to play the violin well. "

In Vienna there was also (15) music, light and popular in (16) . Small street bands of wind and string players played at garden parties or under the windows of people (17) to throw (18) money. Haydn and Mozart wrote many outdoor entertainment (19) , (20) they called divertimentos or serenades. Vienna’s great love of music and its enthusiastic demand for new works made it the chosen city of Haydn, Mozart and Beethoven.

4()

A.great

B.brilliant

C.unique

D.classical