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icetea07
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Homework Statement
A kid turns his bike upside down and spins the tire at 2 revolutions per second. The spoked wheel measures 26 inches in diameter and weighs 5 lbs. The kid presses a piece of metal against the rubber tire to bring it to a halt. About how long will it take to bring the wheel to a halt if the kid presses with a force of 10 lbs?
Homework Equations
I=1/2 MR^2 ƩT = I(angular accel)
The Attempt at a Solution
I=1/2*5*13^2 = 422.5
ƩF=ma
422.5=10a
a=42.25
ω=ω+(angular Accel)t
0=12.567+42.25t
t=.3 sec