I am in deperate need of help Physics

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To calculate the average density of a white dwarf, use the mass of the sun and the radius of the Earth. The free fall acceleration can be determined using gravitational formulas based on these values. Gravitational potential energy for a 1.00-kg object on the surface can also be calculated using the same parameters. Initial guidance from class notes and basic physics principles helped the user regain focus. Understanding these concepts is crucial for solving the problem effectively.
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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.
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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