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artcher [175]
3 years ago
12

A 1.3-kg model airplane flies in a circular path on the end of a 23-m line. The plane makes

Physics
1 answer:
storchak [24]3 years ago
4 0

(a) The plane makes 4.3 revolutions per minute, so it makes a single revolution in

(1 min) / (4.3 rev) ≈ 0.2326 min ≈ 13.95 s ≈ 14 s

(b) The plane completes 1 revolution in about 14 s, so that in this time it travels a distance equal to the circumference of the path:

(2<em>π</em> (23 m)) / (14 s) ≈ 10.3568 m/s ≈ 10 m/s

(c) The plane accelerates toward the center of the path with magnitude

<em>a</em> = (10 m/s)² / (23 m) ≈ 4.6636 m/s² ≈ 4.7 m/s²

(d) By Newton's second law, the tension in the line is

<em>F</em> = (1.3 kg) (4.7 m/s²) ≈ 6.0627 N ≈ 6.1 N

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            I / I₀ = 10 (β / 10)

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when we place the three instruments together their sounds reinforce

           I_total = I₁ + I₂ + I₃

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           I_total = 0.00251 + 0.0501 + 0.1995

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         β = 10 log (0.25211 / 1 10⁻¹²)

           β = 114 db

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