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Choose a Gaussian cylinder of radius r and length L. A student on a scale, hopping up and down, will illustrate the same point, namely a scale-reading that is wildly time-dependent and therefore different from what we would like to call “the” mass or “the” weight. The set of resonant frequencies then must be 650 Hz, 550 Hz, 450 Hz, 350 Hz, 250 Hz, 150 Hz, 50 Hz. The average density of the Earth is significantly higher, so higher-density material must be down below the surface. density is then ρ = P1.3 a fb g e j With V = base area height V = π r 2 h and ρ = ρ= a fa ρ = 2.15 × 10 kg m 3 3 9 3. m for both.

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