问题
填空题
| 选择方框内的单词完成下列句子，使句子通顺、正确。每词限用一次。 | |||||
2.Lucy is of the two girls over there. 3.He has the money. 4.She became the number one singles player in the ITTF in 1993. 5.Tony spent two and forty dollars on that yellow coat. |
答案
1.is 2.the taller 3.least 4.women’s 5.hundred
光滑圆弧轨道，圆弧轨道与水平轨道在O′点相切。车右端固定一个尺寸可以忽略、处于锁定状态的压缩弹簧，一质量m=1.0kg的小物块紧靠弹簧放置，小物块与水平轨道间的动摩擦因数μ=0.5。整个装置处于静止状态，现将弹簧解除锁定，小物块被弹出，恰能到达圆弧轨道的最高点A。取g=10m/2，求：