For a harmonically excited single degree of freedom viscous damped system, which one of the following is correct?

Spring force and inertia force are in phase, and damping force leads them by \[90{}^\circ \]

Inertia force leads damping force by \[90{}^\circ \] while damping force leads spring force by\[90{}^\circ \].

Spring force leads damping force by \[90{}^\circ \] while damping force leads inertia force by\[180{}^\circ \].

Spring force and damping force are in phase, and inertia force leads them by \[90{}^\circ \]

For a harmonically excited single degree of freedom viscous damped sys

1.	For a harmonically excited single degree of freedom viscous damped system, which one of the following is correct?
A.	Inertia force leads damping force by \[90{}^\circ \] while damping force leads spring force by\[90{}^\circ \].
B.	Spring force leads damping force by \[90{}^\circ \] while damping force leads inertia force by\[180{}^\circ \].
C.	Spring force and damping force are in phase, and inertia force leads them by \[90{}^\circ \]
D.	Spring force and inertia force are in phase, and damping force leads them by \[90{}^\circ \]
Answer» D. Spring force and inertia force are in phase, and damping force leads them by \[90{}^\circ \]

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For a harmonically excited single degree of freedom viscous damped system, which one of the following is correct?

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