Question

A hollow cylinder ,1cm thick is made of metal.Its external diameter is 12cm and its weight is 5.520kg.If the density of the metal is 8.00cm-3,calculate correct to the nearest cm the length of the cylinder

Answer 1

Answer:

d =

m

V

m = d×V

V =

m

d

DENSITY

Density is defined as mass per unit volume.

d =

m

V

Example:

A brick of salt measuring 10.0 cm x 10.0 cm x 2.00 cm has a mass of 433 g. What is its density?

Step 1: Calculate the volume

V = lwh = 10.0 cm × 10.0 cm × 2.00 cm = 200 cm³

Step 2: Calculate the density

d =

m

V

=

433

g

200

c

m

³

= 2.16 g/cm³