The flywheel shown above has a mass of 450.0 kg, a radius of 0.450 meters and is
ID: 2254776 • Letter: T
Question
The flywheel shown above has a mass of 450.0 kg, a radius of 0.450 meters and is rotating at 350.0 rpm. If the electrical energy from this flywheel is connected to a 100.0 watt lightbulb, it will be able to keep the bulb lit for ______ minutes.
The flywheel shown above has a mass of 450.0 kg, a radius of 0.450 meters and is rotating at 350.0 rpm. If the electrical energy from this flywheel is connected to a 100.0 watt lightbulb, it will be able to keep the bulb lit for minutes. Note: Assume no energy is lost to heat or sound. Assume moment of inertia for flywheel is MR2Explanation / Answer
Rotational energy = 0.5*I*w^2,
where I = moment of inertia = m*r^2 = 450*0.45^2 = 91.125 kg-m^2
w = angular speed = 350 rpm = 36.652 rad/s
Thus, energy, E = 61207.255 J
Power of bulb = 100 W = E/time
Hence time bulb will remain lit = E/Power = 612 s = 10.2 min