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प्रश्न
A flywheel of mass 2 kg has radius of gyration 0.5m. If it makes 10 r.p.s. then its rotational kinetic energy will be ______.
पर्याय
100π2 erg
50π2 J
100π2 J
50π2 erg
MCQ
रिकाम्या जागा भरा
उत्तर
A flywheel of mass 2 kg has radius of gyration 0.5m. If it makes 10 r.p.s. then its rotational kinetic energy will be 100π2 J.
Explanation:
`"K.E." =1/2Iomega^2=1/2"mk"^2(2pi"f")^2`
`=1/2"mk"^2xx4pi^2"f"^2=1/2xx2xx(0.5)^2xx4pi^2xx(10)^2`
= 100π2 J
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Radius of Gyration
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