When a certain simple pendulum is set swinging, its angular displacement θ as a function of time t obeys the equation θ = 8.5° cos(2.4 s^-1^t). How long is the pendulum?

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The Answer of When a certain simple pendulum is set swinging, its angular displacement θ as a function of time t obeys the equation θ = 8.5° cos(2.4 s^-1^t). How long is the pendulum?

When a Certain Simple Pendulum Is Set Swinging, Its Angular