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An ideal mass-spring oscillator has m=0.9 kg and k=390 N/m. Calculate its period. Round the final result to 4 decimal places if needed. Answer in s.
Answer and explanation
0.3018 s
Angular frequency is √(k/m); period is 2π divided by that angular frequency.
University · Oscillations
An underdamped oscillator obeys m x″+b x′+kx=0 with m=3 kg, b=0.4 kg/s and initial envelope 3 cm. Find its envelope after 20 s. Round the final result to 4 decimal places if needed. Answer in cm.
Answer and explanation
0.7908 cm
The decay constant is b/(2m) = 0.4/(6) s⁻¹. Multiply the initial envelope by exp[−bt/(2m)].
University · Oscillations
Two sound intensities satisfy I₂/I₁ = 158. Calculate L₂ − L₁ in decibels. Round the final result to 4 decimal places if needed. Answer in dB.
Answer and explanation
21.9866 dB
Apply 10 log₁₀(158); the reference intensity cancels in the difference.