Question: A (150 mathrm{~kg}) engine operates at speeds between 1000 and (2000 mathrm{rpm}). It is desired to achieve at least 85 percent isolation at all speeds.

A $150 \mathrm{~kg}$ engine operates at speeds between 1000 and $2000 \mathrm{rpm}$. It is desired to achieve at least 85 percent isolation at all speeds. The only readily available isolator has a stiffness of $5 \times 10^{5} \mathrm{~N} / \mathrm{m}$. How much mass must be added to the engine to achieve the desired isolation?

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