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minelly1717
15.04.2020 •
Physics
A star with the same mass and diaeter as the sun rotates about a central axis with a period of 25 days. Suppose that this star runs out of nuclear fuel and collapses to form a white dwarf star with a diameter equal to that of the earth. What would be the new rotation period of the white dwarf
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Ответ:
182.5 s
Explanation:
From the law of conservation of angular momentum,
I₁ω₁ = I₂ω₂
where I₁,ω₁ are the rotational inertia and angular speed of the star and I₂,ω₂ are the rotational inertia and angular speed of the white dwarf star
I₁ = 2/5MR₁² where M = mass of star and R₁ = radius of star = radius of sun = 696340 km
I₂ = 2/5MR₂² where M = mass of white dwarf star = mass of star and R₂ = radius of white dwarf star = radius of earth = 6400 km
ω₁ = 2π/T₁ where T₁ = period of star = 25 days = 25 × 24 × 60 × 60 s = 2.16 × 10⁶ s
ω₂ = 2π/T₂ where T₂ = period of white dwarf star.
So, I₁ω₁ = I₂ω₂
2/5MR₁² × 2π/T₁ = 2/5MR₂² × 2π/T₂
R₁²/T₁ = R₂²/T₂
T₂ = T₁R₂²/R₁² = 2.16 × 10⁶ s × (6400 km/696340 km)² = 182.5 s
Ответ:
52 / 4 = 13 m/s
Explanation: