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1st - figured out the accelration = 8.75E3 * 9.8 = 155 m/s

2nd converted it to m/hour 155 m/s * 60s/h = 9300 m/h

3rd calculated the total distance of 1 rotation = 2*.28*pi = 1.76 m

4th divided velocity / distance = 5284 rpm

But it says my answer is incorrect. What am I doing wrong (beside working on physics homework at 3am)?

Thanks!

-Serena