- #1
orangeincup
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Homework Statement
You have been assigned the task of designing a flywheel capable of storing
the translational kinetic energy of a 600 kg car traveling at 100 km/hr. The
flywheel is to be manufactured out of steel and the maximum rotational
speed is 12,000 rpm.
a. Assuming that the flywheel is a uniform cylindrical disk 50 mm in
thickness, calculate the mass and diameter of the flywheel.
Homework Equations
ω=2π/60
TKE=1/2mv^2
Ig=1/2mr^2
RKE=1/2Ig*ω^2
The Attempt at a Solution
Solving for ω[/B]
12000rpm*2pi/60=1256.6 rad/s
Solving for energy TKE
100*1000/3600=27.8m/s
1/2*600*27.8m/s=231481J
Solving for Ig(moment of inertia flywheel)
RKE=1/2Ig*ω^2
231481=1/2Ig*1256.6^2
Ig=0.293KG
At this point I'm not sure how to go further.