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The one with the higher mass on level three is worse. Assuming the building as an SDF vibration for simplicity: The period of the building will moderately increase due to the reduction of K, $$K=P/\delta$$ By moving mas from 2nd floor to 3rd floor we increase deflection by roughly 1.2 hence decreasing the K by 1/5. Natural frquency \$ \ \omega_n=\sqrt\frac{K}...

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It can't be done Indeed, this problem is unsolvable using only equilibrium equations. Broadly speaking, structures can be split into three categories: hypostatic: when there are too few supports to keep the structure stable. These are commonly called "mechanisms" isostatic or statically determinate: when there are exactly as many supports as ...

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I am 68 kilograms and you could never convince me to sit on this! let's say the table is 90cm high and the legs can extend out, by just eyeballing and correct me please, 50cm. and your lege ar 2cm pipe and the screws are on a 3cm diameter circle. One can not carefully place the load at the center of the table every time, also because of the fact the legs are ...

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