Radial acceleration of a discus

[niyati]

This may seem like a silly way to second-guess an answer, but the problem below seems to have an answer entirely too easy to obtain. And I doubt that I'm getting any better.

An athlete rotates a 1.00-kg discus along a circular path of radius 1.06m. The maximum speed of the discus is 20.0m/s. Determine the magnitude of the maximum radial acceleration of the discus.

ar = -ac = -(v^2/r)
= -(20^2/1.06)
= -377.358 m/s^2

 

[Doc Al]

The problem is as easy as it seems. (Maybe you're getting better despite yourself. ) Your answer is correct--except for the minus sign and carrying too many significant figures.

 

[niyati]

Ah, yes, I know about the extensive amount of decimal points, but I round at the end. XDDD

And, well, stupid mistake. XD I put parantheses around the fraction and then put the negative sign in my notes, but I checked back in my textbook after your reply and fixed it.

:)

Thank you!