A lawn sprinkler oscillates with simple harmonic motion of period T = 52.0 s, and sprays water with an angle to the vertical (θ = 0) that varies from θ = - 45° to θ = 45°, as shown in FIGURE 13-31. Water from the sprinkler lands in a nearby garden patch when the angle the sprinkler makes with the vertical is greater than θ = 36°. For what amount of time is the sprinkler watering the garden during one complete cycle of its oscillation?

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0 = -45° e = 45° Garden patch