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Marina86 [1]
3 years ago
9

How to measure the density of a white dwarf if its diameter is 1000 km and weighs 10³⁰ kg?

Physics
1 answer:
Afina-wow [57]3 years ago
6 0

Well, first of all, 10³⁰ kg is its mass, not its weight.

-- Density of anything is (its mass) divided by (its volume).

-- You know the white dwarf's mass.

-- The volume of any sphere is  (4/3) (pi) (radius)³

-- The radius is  1/2  of the diameter.

--  Now you have the ball.  Run with it.

I did it quickly and got  (1.91 x 10¹²) kilogram/meter³ .
That may be wrong.  You have to check it.  And even
if it's correct, you probably want to express density in
units of gram/cm³ the way everybody always does.

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What is the frequency of an ocean wave that is traveling at a speed of 45 m/s if it has a wavelength of 3 meters.
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3 years ago
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Here is the answer.

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