why we express the unit of torque in Nm.even though it can
be expressed as Joule ( J )?
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Answer Posted / khalid usmani
for example .
if we have to find diameter of shaft of any material and we
take as C-45 material of shaft whose permissible shear
stress is 45*10^6 N/M^2
SO as Torque = (22/7)/16 * (shear stress) * d^3
therefore its unit will be Nm
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