Rotational motion: Number of revolutions before a flywheel comes to rest

[Bolter]

Homework Statement

Working out number of revolutions before flywheel comes to rest

Relevant Equations

Rotational equivalent of SUVAT equations

Hi there

I have been having a go at this question and I'm uncertain if my answer to part b) is valid?

The problem is when I plug this into the calculator I get 6.379... revs however this doesn't make sense to me. 2*pi is roughly 6.28 radians so doing 4.061... rads / 6.28 rads = 0.647 revs

Thanks!

 

[kuruman]

I get 0.646 revs. Redo the calculation or use a spreadsheet for independent confirmation.

 

[Bolter]

I get 0.646 revs. Redo the calculation or use a spreadsheet for independent confirmation.

Ok thanks. I just checked on an online calculator and get the same now as you. I suppose my calculator is just malfunctioning and acting really dodgy