A radioactive isotope has a half-life of 8 days. What fraction of the original sample remains undecayed after 32 days?

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A 2 kg block slides down an incline of angle $3 0^{\circ}$ with a constant speed. What is the coefficient of kinetic friction $μ_{k}$ between t…
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A sound wave travels from air into water. Which wave property remains completely unchanged during this transition?
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