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T=I * alpha (assuming friction, gyroscopic effects to be negligible)

I have figured out a few ways. Please verify if I'm in the right path for figuring this out:

1. The whiplash effect from a vehicle crashing into the rear of the vehicle is 40 m/sec2. I could take the angular acceleration of the seat swivelling out as 1/10 th of this i.e. 4 m/sec2, assuming this to be in the comfortable for the passenger...??

2. I do not have a working prototype but I could use a computer chair attached to a lever arm of 400 mm radius such that it swivels 90 degrees. I would then use a dynamometer to measure the torque required directly at the swivelling centre.

Thank you