Calculating Frequency of Vibration for 0.3kg Mass Suspended from 200Nm Spring

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The discussion focuses on calculating the frequency of vibration for a 0.3kg mass suspended from a 200Nm spring. The solution involves using the formulas ω = √(k/m) and f = ω/2π. The calculated angular frequency (ω) is 25.82 radians per second, leading to a frequency (f) of 4.11 Hz. Participants confirm the calculations appear correct and express satisfaction with the solution. The discussion highlights the application of fundamental physics equations in solving vibration problems.
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Homework Statement


A mass of 0.3kg is suspended from a spring 200Nm. If the mass is displaced by 10mm from its equilibrium position and released, for the resulting vibration, calculate:

a. the frequency of vibration.


Homework Equations


ω = √ k/m
f = ω/2∏

The Attempt at a Solution


ω=√ 200/0.3 = 25.82 rads-1

so f = ω / 2∏

f = 25.82/2∏ = 4.11Hz

Does this seem to be correct? Any help would be appreciated.
 
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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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