Question

a person wants to measure the weight of a dumbbell. he should
use a beaker with water and record the weight in n.
use a scale and record the weight in cm³.
use a beaker with water and record the weight in cm³.
use a scale and record the weight in n.

Explanation:

Step1: Analyze the measuring tool

A beaker with water is used to measure volume (by displacement method), not weight. A scale is used to measure weight.

Step2: Analyze the unit

The unit \(cm^{3}\) is for volume. The unit \(N\) (Newton) is the SI - unit of force (weight, \(W = mg\), where \(m\) is mass and \(g\) is the acceleration due to gravity)

Answer:

use a scale and record the weight in \(N\).