Physics 271: Advanced Honors Physics I
Recitation #9
Fall 2017
18. (a) 9.70 x 10^-2
m/s^2 (assume the axle is massless and the disks are uniform;
set up Newton's second law in vertical direction and the rolling
condition relating a and alpha, solve for a to get a = g/101)
(b) the same as (a) (the sign of the torque and the sign in the
rolling condition relating a and alpha both change)
(c) 1.1 kN
(d) No (and a good thing too -- engineers always should leave a
generous "factor of safety"...)
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