A wheel rotates about a fixed axis. Initial angular velocity of 20 rad/s.(adsbygoogle = window.adsbygoogle || []).push({});

During a 5 s interval the ang. velocity increases to 40 rad/s. (const angular acceleration) How many radians does the wheel turn in 5 s?

Having a bit of trouble, not quite sure why...

so I start out with

w = w0 + at

40 = 20 + a*5

a = 4

w^2 = w0^2 + 2*4*theta

theta = 150 radians

I thought that was the correct answer, however, that's not one of the choices. Anyone see what I'm doing wrong?

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# Homework Help: Angular kinematics

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