The shear stress τ in a shaft of diameter
D under a torque T is given by:
τ = kT
Determine the approximate percentage error
in calculating τ if T is measured 3% too
small and D 1.5% too large.
(answer 7.5% decrease)
this is a question from J bird engineering mathematics book. it gives the answer but i need to know how to do the method.
any help much appreciated :)