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We analyze a simple pendulum, as shown in Figure 3, in a rotating coordinate frame.

At t = 0, the mass m is located at 0 = 0, moving in the direction of positive 0. The period of the pendulum is P. The rotating coordinate frame spins around the z axis with constant angular velocity vector Draw a free-body diagram that shows all applicable forces, including inertial forces,in the rotating coordinate frame at t= P/4.

Fig: 1

Fig: 2

Fig: 3

Fig: 4