Question

You decide you want to carry a boulder home from the beach. It is 30cm on each side
and so has a volume of 27,000 cm. It made of granite, which has typical density of
2.8 g/cm'. How much will this boulder weigh?
​

Answer 1

75600 gm or 75.6 kg

Explanation:

density =mass/ volume

mass=density × volume

mass=27000×2.8=75600gm

Answer 2

The weight of boulder will be 75.6kg.

Given,

side = 30cm

volume = 27000$cm^{3}$

density = $2.8g/cm^{2}$

To find,

boulder weight

Formula to be used,

$density = \frac{mass}{volume}$

Density of any substance is the mass per unit of volume, the symbol ρ is generally used to denote density and the SI unit is kilogram per cubic meter  $kg/m^{3}$.

volume × density = mass

Substituting the values of volume and density in the formula,

mass = 27000×2.8

mass = 75600g = 75.6kg

Therefore, the weight of boulder will be 75.6kg.