Why Does My Calculation of Centripetal Force Keep Giving the Wrong Answer?

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melopelo
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Your roommate is working on his bicycle and has the bike upside down. He spins the 60-cm-diameter wheel, and you notice that a pebble stuck in the tread goes by four times every second. What is the centripetal force? i know the speed is 7.5 m/s and the equation is a=v^2/r but it keeps on giving me the incorrect answer of 1.875. Help!
 
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I mean acceleration my b
 
Please do not post those sorts of questions in this forum. This section is for introductions only. :)
 
melopelo, please post your homework in the proper homework section.

Thank you.
 
Hi everyone, I'm just a physics enthusiast. I took some first-year courses a long time ago, but I wasn't able to continue, so I don't have a degree. Still, I'm really passionate about the subject and try to keep up with it as much as I can. I mostly study in my (limited) free time, going through books I didn’t get the chance to read when I was younger. Thanks for your attention!
Hello everyone, I'm AlexR, a passionate physics enthusiast from Wisconsin, USA. I've been fascinated by the wonders of the universe for as long as I can remember, and I'm excited to join this community to deepen my understanding and engage in insightful discussions. Background: I hold a Bachelor’s degree in Physics, and my journey into physics began during my academic years. Over time, my interest has expanded to various areas, including: Classical Mechanics: Exploring the foundational...
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