Gravitational Near Earth Surface.

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SUMMARY

The discussion centers on calculating the minimum mass of a neutron star with a radius of 7 km rotating at 1000 revolutions per second to ensure that surface material remains in place. The key equation involves gravitational force and centripetal acceleration, specifically utilizing the formula for gravitational force, F = G(m1*m2)/r^2, where G is the gravitational constant (6.67 x 10^-11). A critical error identified in the calculations was the omission of cubing the radius (R) in the formula, which is essential for accurate results.

PREREQUISITES
  • Understanding of gravitational force equations
  • Familiarity with centripetal acceleration concepts
  • Knowledge of neutron star properties
  • Basic proficiency in algebra and unit conversions
NEXT STEPS
  • Review gravitational force calculations involving neutron stars
  • Study the effects of rotation on celestial bodies
  • Learn about the properties and behavior of neutron stars
  • Explore advanced astrophysics concepts related to mass and density
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Astronomy students, astrophysicists, and anyone interested in the mechanics of neutron stars and their rotational dynamics.

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Homework Statement



Certain neutron stars (extremely dense stars) are believed to be rotating at about 1000 rev/s. If such a star has a radius of 7 km, what must be its minimum mass so that material on its surface remains in place during the rapid rotation?

Homework Equations



cramster-equation-201031601226340429448270400007570.gif




The Attempt at a Solution



(7x10^3)(1000*2pi)/6.67*10^-11= 2.0301495

I'm getting it wrong. Any hints why?
 
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You forgot to cube the value of R.

ehild
 

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