How Do Uniform Spherical Objects Affect Gravitational Force Calculation?

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The discussion focuses on calculating the gravitational force between two parts of a space probe, weighing 11,000 N and 3,400 N, separated by 12 m. The gravitational force formula used is Fg = Gm1m2/r^2. There is confusion regarding the mass values provided by the professor, with one participant noting discrepancies in the calculations. The participant also points out a labeling error in the homework sheet that contributed to the misunderstanding. The thread concludes with the participant suggesting the post be deleted due to the confusion.
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Homework Statement


On earth, two parts of a space probe weigh 11 000 N and 3400 N. These parts are separated by a center-to-center distance of 12 m and may be treated as uniform spherical objects. Find the magnitude of the gravitational force that each part exerts on the other out in space, far from any other objects.

Homework Equations



Fg = Gm1m2/r^2

The Attempt at a Solution



I have a homework sheet that the professor gives out to help us. In his answer he has m1 = 7.2kg and m2 = .38kg

How did he get this?
I get 1123.4 and 346.9

Also how did he find that r1 = .11m and 42 = .028m??
 
Last edited:
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nvm, he had the numbers mixed up. his #18 was labeled as 19 and vise versa..

sorry guys, you can delete this post

=D
 

Thread 'Magnitude of buoyant force in fluids of different densities'

The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?
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