Question 1047148
F=k*(1/R)*M*V^2
247=k*(1/400)*1200*35^2; (k can be different if we use ft/sec, but it will still give the same answer at the end)
247/3675=0.06721
F=0.06721*(1/850)*1200*60^2
F=341.59 pounds or 342 pounds.
Check.  The radius increases by about 2.1 approximately but the speed increases by 1.7^2 or about 2.9 , so this should increase the force by approximately 1.38.  The ratio is 1.38, which confirms it.