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实验室里有一杯浓盐水和一杯纯水，其标签已模糊不清。现有天平、量筒、烧杯、刻度尺、小木块，能够把它们区分开的器材组合是（　　） A．天平、量筒 B．天平、烧杯、...

Mar 19, 2024

实验室里有一杯浓盐水和一杯纯水，其标签已模糊不清。现有天平、量筒、烧杯、刻度尺、小木块，能够把它们区分开的器材组合是（　　） A．天平、量筒 B．天平、烧杯、刻度尺 C．烧杯、小木块 D．量筒、烧杯、刻度尺

Solution

Determine the density of the liquids using the balance and graduated cylinder. Measure equal volumes of the saltwater and the pure water using the graduated cylinder, and weigh them on the balance. The one with the higher mass is the saltwater because saltwater is denser than pure water

Use the balance and the beaker to measure the mass of a certain volume of each liquid. The beaker can be used to hold the liquids while weighing. The graduated cylinder is not necessary if the beaker has volume markings

The scale ruler is not necessary for the differentiation process, as the mass and volume measurements are sufficient to determine density differences

The small wooden block is not relevant to this method of distinguishing between saltwater and pure water

Key Concept

Density and Buoyancy: Density is mass per unit volume. Saltwater has a higher density than pure water due to the dissolved salt. Buoyancy could also be used to distinguish between the two, as an object would float differently in each liquid, but this is not necessary with the given equipment.

Explanation

By comparing the mass of equal volumes of the two liquids, we can determine which one is saltwater because it will have a higher mass due to its higher density. The combination of a balance and a beaker (if it has volume markings) or a graduated cylinder is sufficient to make this determination.

这是一道多选题

Solution

根据题目信息，这是一道多选题，但是没有给出具体的物理力学问题。

由于没有提供具体的物理力学问题，无法应用物理力学的概念和公式来解答。

Key Concept

由于这是一道多选题，但没有提供具体的物理力学问题，所以无法直接应用物理力学的概念和公式。在物理力学中，通常需要明确的问题描述和相关数据才能进行计算和分析。

Explanation

由于题目没有给出具体的物理力学问题，所以无法提供一个基于物理力学的解答。如果学生能够提供具体的问题，那么可以使用物理力学的相关概念和公式来解答。