A block of substance has a width of 3.8 cm, a length of 8.2 cm, and height of 7 cm. Its mass is 0.68 kg. Calculate the density of the substance.

d = 3.11 g / cm³

Explanation:

Volume -

The volume of a cuboidal object can be calculated by multiplying the length, width and height,

Hence, Volume (V) = l * w * h,

From the question,

l = 8.2 cm

w = 3.8 cm

h = 7 cm

Hence, the volume is,

V = l * w * h

V = 8.2 cm * 3.8 cm * 7 cm

V = 218.12 cm³

Density -

Density of a substance is given as the mass divided by the volume,

Hence,

d = m / V

From the question,

m = 0.68 kg

since,

1 kg = 1000g

m = 0.68 * 1000 = 680 g

V = 218.12 cm³ (calculated above)

Hence, the value of density can be calculated by using the above equation,

d = m / V

d = 680 g / 218.12 cm³

d = 3.11 g / cm³