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ritvikjain2090ow0ydl:
what is the last line?
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Energy gained = Change in rotational kinetic energy
= 0.5I (ωf² - ωi²)
= 0.5I (4ωi² - ωi²)
= 1.5Iωi²
= 1.5 × 125 kgm² × (120/60 × 2π rad/s)²
= 29608.8 J
= 29.60
Energy gained is 29.60 kJ
= 0.5I (ωf² - ωi²)
= 0.5I (4ωi² - ωi²)
= 1.5Iωi²
= 1.5 × 125 kgm² × (120/60 × 2π rad/s)²
= 29608.8 J
= 29.60
Energy gained is 29.60 kJ
how did u get 0.51
It’s 0.5 × Moment of inertia
Rotational kinetic energy = 0.5 × Moment of inertia × (Angular Velocity)²
it is a formula
it is a formula ?
Yes.
Same like kinetic energy = 0.5 × mass × (velocity)²
Thank u
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