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Find the differential equation of y=5co...

Find the differential equation of ` y=5cos3x`

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The correct Answer is:
A, B, D
`tau=Ia`
`rarr Fxr=(mr^2+mr^2)alpha`
`rarr 5x0.25=2mr^2xxalpha`
`rarr alpha=1.25/(2xx0.5xx0.025xx0.25)`
=20
`omega_0=10rad/s `
`t=0.10sec`
`omega=omega_0+alphat`
`- omega=10+0.10x20`
`=10+2=12rad/s
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