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The problem:
Consider a spherical planet of uniform density [tex]\rho[/tex]. The distance from the planet's center to its surface (i.e., the planet's radius) is [tex]R_{p}[/tex]. An object is located a distance [tex]R[/tex] from the center of the planet, where [tex]R\precR_{p}[/tex] . (The object is located inside of the planet.)
Part A
Find an expression for the magnitude of the acceleration due to gravity, [tex]g(R)[/tex] , inside the planet.
Express the acceleration due to gravity in terms of [tex]\rho[/tex], [tex]R[/tex], [tex]\pi[/tex], and [tex]G[/tex], the universal gravitational constant.
Part B
Rewrite your result for [tex]g(R)[/tex] in terms of [tex]g_{p}[/tex], the gravitational acceleration at the surface of the planet, times a function of R.
Express your answer in terms of [tex]g_{p}[/tex], [tex]R[/tex], and [tex]R_{p}[/tex].
My attempt at a solution:
I determined the answer to Part A to be [tex]g(R)=(4/3)G\rho \pi R[/tex]. However, I am uncertain how to find the answer to Part B. I barely even understand what they are asking me to do. I could really use some hints to point me in the right direction.
Thanks.
Consider a spherical planet of uniform density [tex]\rho[/tex]. The distance from the planet's center to its surface (i.e., the planet's radius) is [tex]R_{p}[/tex]. An object is located a distance [tex]R[/tex] from the center of the planet, where [tex]R\precR_{p}[/tex] . (The object is located inside of the planet.)
Part A
Find an expression for the magnitude of the acceleration due to gravity, [tex]g(R)[/tex] , inside the planet.
Express the acceleration due to gravity in terms of [tex]\rho[/tex], [tex]R[/tex], [tex]\pi[/tex], and [tex]G[/tex], the universal gravitational constant.
Part B
Rewrite your result for [tex]g(R)[/tex] in terms of [tex]g_{p}[/tex], the gravitational acceleration at the surface of the planet, times a function of R.
Express your answer in terms of [tex]g_{p}[/tex], [tex]R[/tex], and [tex]R_{p}[/tex].
My attempt at a solution:
I determined the answer to Part A to be [tex]g(R)=(4/3)G\rho \pi R[/tex]. However, I am uncertain how to find the answer to Part B. I barely even understand what they are asking me to do. I could really use some hints to point me in the right direction.
Thanks.