Question$-4-$ Engineering has conducted a vibration test on a $78$ kg mechanical part. In this test, the mechanical part tested on zinc

An elastic bed is placed. During the test, the piece is stimulated with a harmonic force of $6800$ newtons. The maximum vibration amplitude for the mechanical part at the frequency of $46$ Hz is $3\mathrm{.}9$ mm$.$ If we consider the elastic bed as viscous with the approximation of depreciation engineering; Calculate the elastic bed with the information obtained from the hardness and wear test.

$4-78..6800.463\mathrm{.}9.k$ c $.$