(1) 圆柱体 A 的重力为______ N; (2) 从开始加液体到液体深度为 7.5cm 时,圆柱体 A 对传感器刚好无压力,则该液体密度为______ kg/m³; (3) 细线的长度为______ cm; (4) 圆柱体 A 刚好浸没在液体中时,细线对传感器的拉力为______ N; (5) 当液体深度为 20cm 时,停止注入液体,切断细线,最终物体静止时,容器底部受到的液体压强为______ Pa。
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**Problem Context:**
2. 明珠少年科学院的同学们受邀为雕塑公园景观池设计液体深度监测仪。
**Problem Description:**
图甲为他们设计的模拟装置示意图,一个底部有传感器(固定在容器底)的薄壁圆柱形容器(足够深),容器底面积为 250cm²,传感器的体积忽略不计,将一个底面积为 200cm²、高 10cm 的圆柱体 A 放在传感器上方,A 与传感器通过不可伸长的细线(质量、体积都不计)相连,向容器中加某种液体,传感器测得的圆柱体 A 对它的压力或者绳子对它的力 F 随容器中液体深度 h 的变化关系图象如图乙所示。
**Diagram 甲 (Figure A) Description:**
* Type: Schematic diagram.
* Elements:
* A cylindrical container (labeled "甲" at the bottom).
* A sensor at the bottom of the container (represented by a black rectangle, labeled "传感器").
* A rectangular object labeled "A" inside the container, positioned above the sensor.
* A line segment connecting the bottom of object A to the sensor, representing a thin line (string).
**Diagram 乙 (Figure B) Description:**
* Type: Line chart (Force vs Depth).
* X-axis: Liquid depth h in centimeters (labeled "h/cm"). Origin is O. A point is marked at 13.5.
* Y-axis: Force F in Newtons (labeled "F/N"). A point is marked at 12.
* Graph line:
* Starts at (0, 12).
* Decreases linearly from (0, 12) to a point on the h-axis (F=0).
* Is a horizontal line segment at F=0 from that point on the h-axis to (13.5, 0).
* Increases linearly from (13.5, 0) upwards (indicated by a dashed line extension).
**Questions:**
(1) 圆柱体 A 的重力为______ N;
(2) 从开始加液体到液体深度为 7.5cm 时,圆柱体 A 对传感器刚好无压力,则该液体密度为______ kg/m³;
(3) 细线的长度为______ cm;
(4) 圆柱体 A 刚好浸没在液体中时,细线对传感器的拉力为______ N;
(5) 当液体深度为 20cm 时,停止注入液体,切断细线,最终物体静止时,容器底部受到的液体压强为______ Pa。