Question

The mass of a 50 cm length of wire is 3.5 g and

its cross-sectional area is 0.01 cm².
(a) Calculate the
(i) volume of the wire;
(ii) density of the wire.
(b) Name an appropriate instrument that can be
used to measure the diameter of the wire.

Answer 1

V = L A = L pi R^2 volume of wire

V = 50 cm * .01 cm^2 = .5 cm^3

d(density) = 3.5 gm / .5 cm^3 = 7.0 gm/cm^3

A micrometer caliper could measure the diameter of the wire.