Kinematics of Rotational Motion (Gears)

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The discussion focuses on the kinematics of rotational motion, specifically regarding the initial velocity and time for Gear A and its implications for Gear B/Drum C. It confirms that the initial velocity (Vi=0) and time (t=12s) can indeed be assumed for Gear B/Drum C, as they are part of the same system. There is a clarification needed regarding the difference between displacement and velocity in the context of the homework question. The participants agree on the application of rotational and translational kinematics. Overall, the conversation emphasizes understanding the relationships between the gears in rotational motion.
freshbox
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Homework Statement


Since
Gear A
--------
Vi=0
t=12s
θ=40∏

as given in the question, can I assume that Vi=0 t=12s for Gear B/Drum C as well?
If not why?


Thanks..
 

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You can apply rotational and translational kinematic.
For question (d) the question is displacement, answer given velocity
 
what do you mean?
 
freshbox said:
as given in the question, can I assume that Vi=0 t=12s for Gear B/Drum C as well?
Sure.
 
Thanks for the clarification.
 
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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