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The Hubble Space Telescope (HST) has recorded evidence of a black hole at the center of the M87
galaxy. Using Doppler data, it's been measured that matter is orbiting the center of this galaxy at an
orbital speed of 7.5x10
m/s, out at a radius of 5.7x10
m. Calculate the mass of the black hole at the
center of this orbit. If our Sun's mass is 2.0x10
kg, how many solar masses is this black hole? For
comparison, the suspected black hole at the center of our own Milky Way galaxy is estimated to be
around 4 million solar masses.

  • Physics -

    (a)m•v² /R =GmM/R²


    the gravitational constant
    G =6.67•10^-11 N•m²/kg²,

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