Amplitude of an oscillating system graph

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The discussion centers on the effect of placing an oscillating system in a fluid, specifically regarding how the amplitude varies with driving frequency. The original question posed a scenario where the amplitude graph would change when the system is submerged in water. The consensus is that the peak of the amplitude graph would be smaller and shifted to the left due to increased drag from the water, which slows down the oscillations. This aligns with the teacher's explanation that the fluid's resistance affects the system's performance. Overall, the correct interpretation acknowledges that fluid dynamics significantly influence oscillation behavior.
Oerg
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Recently, there was a question i came across that asked:

The graph shows how the amplitude of an oscillating system varies with its driving frequency. What will the resultant graph be if the system is placed in a fluid?

My answer was that the peak would be smaller and shift to the right while my teacher's answer was that it was smaller and shifted to the left.

what would the correct answer be and what would the explanation be for this answer? any help would be appreciated> thanks
 

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If you put the system in water, then the oscillations are going to slow down. That is because water exerts a greater drag than air does. So your teacher is correct.
 
Tom Mattson said:
So your teacher is correct.

Doncha just hate when that happens?
 
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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