Question

Question #185b5

Answer 1

Well, the formula you've used for density is wrong. Density equals mass divided by volume, not multiplied like you show in the question.

`rho = m/V`

I assume the three dimensions of the box (it's acutally a reactangular prism, to be precise) are expressed in mm. Indeed the volume of this box is

`V = A * B * C = "81 mm" * "57 mm" * "43 mm"`

`V = "198531 mm"^3`

This means that the mass of the part is

`m = rho * V = 0.0079` `"g"/"mm"^3 * "198531 mm"^3 = "1568.4 g"`

If you want the answer rounded to two sig figs, the mass is

`m = "1600 g"`, or `m = "1.6 kg"`