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Determine the SI base units of stress. Show your working.
A beam PQ is clamped so that the beam is horizontal. A mass 
of 
is hung from end Q and the beam bends slightly, as illustrated in the figure below.
The length 
of the beam from the edge of the clamp R to end Q is 
. The width 
of the beam is 
and the thickness 
of the beam is 
. The material of the beam has Young modulus 
.
The mass is made to oscillate vertically. The time period 
of the oscillations is 
.
The period is given by the expression:
Determine in 
.
.
.
