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January 29, 2015

January 29, 2015

Posted by **Annie** on Thursday, November 4, 2010 at 8:21pm.

- Physics -
**bobpursley**, Thursday, November 4, 2010 at 8:50pmdisplacement=Wi*t+1/2 alpha*t^2

where alpha is the angular acceleration in rev/sec

you know:

29=wi*9+1/2 alpha*81

and you know

wf=98/2PI rev/sec=wi+alpha*9

wi= 98/2PI-alpha*9

putting that in to the first equation

29=(98/2PI-alpha*9)*9 +1/2 alpha*81

solve for alpha. Now this alpha will be in rev/s^2, in radians/sec^2, divide rev by 2PI to get that.

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