Question

A machine of mass π‘š = 200 kg is supported on two mounts, each of stiffness π‘˜ = 10 kN/m. The machine is subjected to an external force (in N) 𝐹(𝑑) = 50 cos 5𝑑. Assuming only vertical translatory motion, the magnitude of the dynamic force (in N) transmitted from each mount to the ground is ______ (correct to two decimal places).

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Answer :

33.33


Given, m = 200 kg

F(t) = 50 cos 5t = Fo cos Ο‰t

Fo = 50, Ο‰ = 5, ΞΎ = 0

For ΞΎ = 0

FT = 1.333 Γ— Fo = 1.333 Γ— 50 = 66.67 N

Hence the force transmitted to each mount will be,

FT /2 = 66.67/2 = 33.33 N

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