庆“六一”趣味运动会中，小敏和小王分别把图甲中三个重量均为10N、边长为30cm的正方体泡沫塑料块按图乙堆叠起来．小敏和小王叠起这堆正方体泡沫塑料块，每人至少要做功______J．比赛中小敏快于小王完成堆叠，则堆叠过程中小敏做功的功率______（大于/等于/小于）小王．
如图，将2放到1上，h2=30cm=0.3m；将3放到2上，h3=2×30cm=60cm=0.6m；
分别做功：
W2=Gh2=mgh2=10N×0.3m=3J，
W3=Gh3=mgh3=10N×0.6m=6J，
小敏和小王叠起这堆正方体泡沫塑料块，每人至少要做功：
W=W2+W3=3J+6J=9J，
∵P=
，比赛中做功相同，小敏的做功时间短（t小），W t
∴小敏的功率比小王的功率大．
故答案为：9，大于．
| 完形填空。 | ||||
| The wedding took place in a Birmingham hotel. The bride and her father 1 in a new black American sports car. Her father looked nervous and uncomfortable in front of the 2 . The bride wore a silk wedding dress. She smiled 3 at the waiting photographers and went to a room on the first floor where she met her future husband for the 4 first time. Carla Germaine and Greg Cordell were the 5 of a radio station's competition. The aim of the competition was to find two strangers prepared to 6 without having met each other. Miss Germaine, 23, is a model. Mr. Cordell, 27, is a TV salesman. They were among the two hundred people who entered for a 7 "experiment" organized by BMRB radio in Birmingham, England. Greg and Carle were 8 eight finalists who were interviewed live on 9 . They 10 a lie detector test and the station also spoke to their friends and family about their 11 . The competition judges 12 an astrologer (占星家) who declared that they were suited. The 13 celebrated their wedding with a wedding breakfast and a party for 100 guests in the evening, but not everyone 14 their joy. Miss Germaine's mother looked 15 throughout the wedding and Mr. Cordell's parents are reported to be less than delighted. Organizations, including the marriage guidance service Relate, have 16 the marriage. As one person put it, "We have enough problems getting young people to take marriage 17 without this. Marriage should always be about love." The couple are now on a Caribbean 18 followed by journalists. Their other 19 include a year's free use a wonderful apartment in the centre of Birmingham,and a car. But will it 20 ? | ||||
|