I am in deperate need of help Physics

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SUMMARY

The discussion centers on calculating the average density, free fall acceleration, and gravitational potential energy of a white dwarf, specifically referencing the sun's fate post-nuclear fuel exhaustion. The calculations require the mass of the sun and the radius of the Earth. Participants emphasize the importance of reviewing class notes and utilizing fundamental physics formulas to derive the necessary values. The user expresses initial confusion but gains clarity through community guidance.

PREREQUISITES
  • Understanding of white dwarf characteristics and formation
  • Knowledge of basic physics formulas for density, gravitational acceleration, and potential energy
  • Familiarity with the mass of the sun (approximately 1.989 x 1030 kg)
  • Knowledge of the radius of the Earth (approximately 6.371 x 106 m)
NEXT STEPS
  • Calculate the average density of a white dwarf using the formula: density = mass/volume
  • Determine free fall acceleration on the surface of the white dwarf using the formula: g = G * M / r2
  • Compute gravitational potential energy using the formula: U = m * g * h
  • Explore additional resources on stellar evolution and the lifecycle of stars
USEFUL FOR

Students studying astrophysics, physics educators, and anyone interested in the lifecycle of stars and gravitational physics.

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I am in deperate need of help! Physics

The question:
after our sun exhausts its nuclear fuel, its ulitmate fate may be to collapse to a white dwarf state, in which it has approximately the same mass as it has now but a radius equal to the radius of the earth. Calculate: The average density of the white dwarf; the free fall acceleration; the gravitational potential energy associated with a 1.00-kg object on its surface.

I don't even know where to start. I'm lost. PLEASE HELP!
 
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aliciagu said:
I don't even know where to start. I'm lost. PLEASE HELP!
Read your class notes and look up the mass of the sun and the radius of the earth.
 
Thanks! That got me started. I don't know where my head is at today! I think I've got the rest.
 

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