Answer the following, select the best choice, write your answer in the left parenthesis

$(,)1.$ From what information to find KA$?$

$(1)$ Time constant, $(2)$ the excitation frequency, $(3)$ the forcing function, $(4)$ all solutions are correct

$()2.$ From what information, we can find the $?$

It can be provided by $(1)$ the frequency of the forcing function, $(2)$ the natural frequency, $(3)$ the

amplitude of the external force, $(4)$ all solutions are correct

$3.$ How is the coefficient $C$ related to$?$

$(1)$ boundary condition, $(2)$ initial condition, $(3)$ the static sensitivity$,(4)$ all solutions are correct

$4.$ Who control the oscillation of the response?

$(1)$ initial condition, $(2)$ the forcing function, $(3)$ oscillation is not happening, $(4)$ all solutions are not

correct

$()5.$ What happens of the phase angle when the operating frequency is increased?

$(1)$ the phase angle is increased $(2)$ the phase angle is decreased $(3)$ the phase angle increased and then

decreased $(4)$ All solutions are not correct