4. A student needs to find the density of a cube. Each side of the cube measures 2 cm and the mass of the cube is 12 g.
What is the approximate density of the cube?

Science

Density = mass/volume

mass = 12 g

volume = 3cm x 3cm x3cm = 27 cm3

density = 12g/27 cm3 = 0.4 g/cm3 (to 1 significant figure)

Explanation:

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one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.