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प्रश्न
A solid spherical ball rolls on an inclined plane without slipping. The ratio of rotational energy and total energy is ______.
पर्याय
`2/5`
`2/7`
`3/5`
`3/7`
MCQ
रिकाम्या जागा भरा
उत्तर
A solid spherical ball rolls on an inclined plane without slipping. The ratio of rotational energy and total energy is `underline(2/7)`.
Explanation:
KEr = `1/2 "I"ω^2`
= `1/2 (2/5 "mR"^2) ("V"/"R")^2`
= `1/5 "mV"^2`
KETotal = `1/2 "mV"^2 + 1/2 "I"ω^2 = 7/10 "mV"^2`
⇒ Ratio = `2/7`
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