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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~Nomor 23
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Diket :
Momen inersia silinder, I
selang waktu, Δt
kelajuan anguler awal, ωi
kelajuan anguler akhir, ωf
Momentum anguler awal, Li
Momentum anguler akhir, Lf
Tanya :
Momen gaya, τ = ___?
Jawab :
Step 1
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cari percepatan sudut dulu yak, α = __?
Gunakan rumus GMBB
ωf = ωi + α.Δt
α = (ωf - ωi) / Δt
Step 2
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Hukum II Newton tentang Gerak
τ = I. α
τ = I.(ωf - ωi) / Δt
karena L = I.ω maka :
τ = (I.ωf - I.ωi) / Δt
τ = (Lf - Li) / Δt
Jawaban : E
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