The density of gold is 19 300kg/m cube. what is the mass of gold cube with the length 0.2015m?

157.9 kg

Explanation:

Density: This can be defined as the ratio of the mass of a body and it's volume.

The S.I unit of density is kg/m³.

From the question,

Density = Mass/volume

D = m/v Equation 1

Where D = Density of gold, m = mass of gold, v = volume of gold.

make m the subject of the equation

m = Dv Equation 2

Since the gold is a cube,

v = l³ Equation 3

Where l = length of the gold cube.

Substitute equation 3 into equation 2

m = Dl³ Equation 4

Given: D = 19300 kg/m³, l = 0.2015 m

Substitute into equation 4

m = 19300(0.2015)³

m = 157.9 kg.

ill do it for 100, also this isnt 80 its 40

f=ma newton

f=100x2.5=250n