At the instant shown, the rod Ris rotating about its centre of rotation with ω=3.3rad/s.
mA=11.7kg;
The pulley, with mP=11.6kg and RP=0.2m, may be modelled as a uniform disc.
The rod, with mR=6.8kg and L=0.8m, may be modelled as a thin beam rotating about one end.
g=9.8m/s ².
a)What is the magnitude of the acceleration of point B at this instant?

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Here is diagram:

does this work
\(|a| = \sqrt{{a_t}^2 + {a_r}^2}=\sqrt{0+(\omega^2r)^2} = 3.3^2\times 0.8=8.7\)

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