问题
选择题
Bring an extra pencil with you ___ something goes wrong with this one during the exam. [ ]
A. in case
B. in case of
C. so that
D. in order that
答案
答案:A
Bring an extra pencil with you ___ something goes wrong with this one during the exam. [ ]
A. in case
B. in case of
C. so that
D. in order that
答案:A
某兴趣小组开展探究液体产生的压强跟深度有什么关系时,用如图所示装置,在弹簧测力计下挂一实心圆柱体,测得圆柱体的体积为5´10-4m3,圆柱体的重为6 N。当圆柱体缓慢地浸入某种液体中时(圆柱体始终竖直),记下圆柱体下表面所处的深度h、弹簧测力计相应的示数F,并计算出液体在圆柱体下表面处产生的压强为P,所得数据如下表:
实验序号 | 1 | 2 | 3 | 4 | 5 |
h/m | 0.1 | 0.2 | 0.3 | 0.4 | 0.5 |
F/N | 4.8 | 3.6 | 2.4 | 1.2 | 0 |
P/Pa | 1.2´103 | 2.4´103 | 3.6´103 | 4.8´103 |
(2)分析前4次实验数据可知:该液体的密度是____________kg/m3.
(3)在第2次实验中,当弹簧测力计的示数为3.6 N时,圆柱体受到的浮力为_________N,圆柱体浸入液体中的体积是___________m3。
(4)在第5次实验中,圆柱体的下表面对液体产生的压力是____________N,该处对液体产生的压强是_____Pa,实心圆柱体的密度为___________kg/m3。