F9RK. Mgmt. 21, Goal 4

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Uploaded: 24.11.2016
Content: Ф9РК. Упр. 21, задача 4.rar (7,44 kB)

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4. The frequency of oscillation of the wings of a sparrow = 10 Hz, 300 Hz = flies, mosquitoes = 450 Hz. Calculate how many oscillations make their wings for 1 min.

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