If you know the volume and the density of an iron rod, how would you calculate the mass of that iron rod? Show a formula.

for an example

volume can easily be calculated: pi*(d^2/4)*length -> pi*[(7x10^-2)/4]*70x10–2 = volume of iron rod {VOIR}

Density = mass / volume

Therefore

Mass = density x volume

However, weight is equals to ‘mass x g (free fall acceleration’

So mass is in kg but weight is a force so simple force equation to where ‘a (acceleration)’ in ‘F=ma’ is ‘g’.

Hence,

Weight = 9.81 ms^-2 (is ‘g’) x 7870 kgm^-3 x VOIR m^3 is *insert calculated answer* N.

Explanation:

the answer is 0.42 is that is an option. this question provides no info