A cube of cooper 2.00 cm on a side is suspended by a string. The cube is heated with a burner from 20.0◦C to 90.0◦C.The air surrounding the...

Since the material of the cube is copper, we can calculate
the change in volume using the following formula:

(V' -
V)/V = a*(T' - T)

The difference V' - V represents the
change in volume and the difference T' - T represents the change in
temperature.

"a" is the thermal expansion
coefficient

We'll select the thermal expansion coefficient
of copper, that is a = 17 at normal atmospheric
pressure.

We'll calculate teh volume of the
cube:

V = l^3, wher l is the length of the side of the
cube:

V = 2^3 = 8 cm^3

V' - V
= 17*(90-20)*8

V' - V =
9520*10^-6

V' - V =
0.00952

The change in volume of the cube of
copper, heated from 20 to 90 C degrees is V' - V = 0.00952
cm^3.