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    Cross section of a moving star

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    A star of radius R and mass M is moving with velocity v through a cloud of particles of density rho.
    If the particles that collide with the star are trapped by it, show that the mass of the star will increase at rate:

    dM/dt = Pi * rho * v * (R^2 +2GMR/v^2)

    Show how the cross sectional area compares with the geometric cross section of a hard sphere.

    © BrainMass Inc. brainmass.com October 9, 2019, 10:15 pm ad1c9bdddf
    https://brainmass.com/physics/stars/cross-section-moving-star-214157

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