SI units

SI units problem 28

A metal wire has original length . It is then suspended and hangs vertically as shown in the figure below.

The weight of the wire causes it to stretch. The elastic potential energy stored in the wire is .

  • Show that the SI base units of are .

  • The elastic potential energy is given by


    is the density of the metal,

    is the acceleration of free fall,

    is the cross-sectional area of the wire and

    is a constant.

    Determine the SI base units of .


main author and content editor: Joanah Frank