Question regarding gravitational potential

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The discussion focuses on a question regarding gravitational potential and its solution. A review of the calculus involved in calculating dV/dr is suggested, specifically questioning whether dr should be (400000-39000) or (410000-400000) for more accurate results. It is noted that the solution may require using a data table, indicating potential errors in the numbers provided. The second part of the solution is acknowledged as correct. Overall, the emphasis is on refining the calculations for better accuracy.
Sanosuke Sagara
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I have my question and solution in the attachment that followed.
 

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do you know calculus? if yes, review the way you did dV/dr, if dr = (400000-39000) or (410000-400000), the answer will be closer, your second part is right...
 
the solution might expect you use the data table, so the number have some error...
 
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