I\'m having trouble modifying (step by step) and combing twoequations to find al

Question

I'm having trouble modifying (step by step) and combing twoequations to find alpha. Here's the info from College Physics,Serway/Vuille: 8th ed., number 13: t = 3.00 s f = 98.0 rad/s = 232.5 rad The question states, what is the constant angular accelerationof the wheel? I have two equations: (1) = 0 +t     and      (2) =0 t + 1/2 t2 After plugging in: (1) 98.0 rad/s = 0 + (3.00s)    (2) 232.5 rad = 0(3.00s) + 1/2 (3.00s)2 I'm having trouble modifying (step by step) and combing twoequations to find alpha. Here's the info from College Physics,Serway/Vuille: 8th ed., number 13: t = 3.00 s f = 98.0 rad/s = 232.5 rad The question states, what is the constant angular accelerationof the wheel? I have two equations: (1) = 0 +t     and      (2) =0 t + 1/2 t2 After plugging in: (1) 98.0 rad/s = 0 + (3.00s)    (2) 232.5 rad = 0(3.00s) + 1/2 (3.00s)2

Explanation / Answer

= i t + 1/2t2 232.5 rad = i(3s) +1/2(3^2) 3i +4.5 = 232.5rad i +3= 98 i = 98 - 3 plug in original equation... 3( 98 - 3) + 4.5 = 232.5 294 - 9 + 4.5 = 232.5 -4.5 = -61.5 = 13.7 rad /s^2

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