CONCEPTUAL PHYSICS with centrifugal forces: SET UP: Two pulleys of same size and mass are statically loaded with the sam

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CONCEPTUAL PHYSICS with centrifugal forces:
SET UP: Two pulleys of same size and mass are statically loaded
with the same belt tension on both sides. During operation, pulley
A is locked in place and does not spin, while pulley B orbits
around pulley A... Tension = 400 pounds or 1779 newtons: rpm
= 750 or 78.54 rad/s, M = .7kg, r = .3m,
and calculating for F at 750rpm... Mw^2r = 1295 Newtons.
SO....
QUESTION: 1) At this rpm, is it correct that there is no
increase in tension on the belt AND the load at this rpm on the
bearings at B is 484 newtons?
Question 2) Doesn't the bearings on Pulley A increase too because
the belt doesn't stretch? Can you explain this please?
And if there is no change in the bearings at pulley A at this rpm,
then when mw^2r is greater than 1779, then at this point the belt
increases tension and the bearings on pulley A increase? In other
words, 1779 = Mw^2r and solving for w gives 92 rad/s or 879
rpm. So when the rpm reach 879 rpm (92 rad/s) then that's
when the loads change. Is my understanding correct with
this?