Solve Tangential Speed Equation: Planet Radius 5.99x10^6 m, G-Accel 7.87 m/s^2

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To find the tangential speed at the equator of a planet with a radius of 5.99x10^6 m and a gravitational acceleration of 7.87 m/s^2, one must equate centripetal acceleration to gravitational acceleration. The relevant formula for tangential velocity is Vt = rW, where W represents angular velocity. The problem highlights confusion regarding the setup, indicating that the student has struggled with this specific question amidst a larger homework set. Assistance is sought to clarify the relationship between centripetal and gravitational acceleration. Solving this will yield the required tangential speed for a person at the equator.
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Homework Statement



If the rotation of a planet of radius 5.99x10^6 m and free-fall acceleration 7.87 m/s^2 increased to the point that the centripetal acceleration was equal to the gravitational acceleration at the equator, what would be the tangential speed of a person standing at the equator?


Homework Equations


Vt=rW (tangential velocity equals radius times omega, or angular velocity)


The Attempt at a Solution


I don't even know how to go about solving this. The way the problem is set up is confusing to me. This is the only problem out 30 some-odd questions that I have not done correctly. My homework is due at 12:00 tonight and I have almost an A, but this question is really bothering me. Can someone help?
 
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I hope you're not on Eastern Standard Time. You are given the gravitational acceleration. What's the formula for centripetal acceleration? Set them equal.. you'll be going real fast...
 
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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