A physical pendulum consists of 3.8 m long sticks joined together as shown in Fig. 15-41. What is the pendulum's period of oscillation about a pin inserted through point A at the center of the horizontal stick?

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To solve this problem, you can use the formula for the period of a physical pendulum. The period of a physical pendulum is given by the equation:

T = 2π √(I / mgd)

Where:
T = The period of the pendulum (time it takes to complete one full oscillation)
π = Pi, approximately 3.14159
I = The moment of inertia of the pendulum about the pivot point
m = The mass of the pendulum
g = Acceleration due to gravity
d = Distance between the center of mass of the pendulum and the pivot point

To find the period of the pendulum, you will need to know the moment of inertia (I) of the pendulum and the distance (d) between the center of mass and the pivot point. The mass (m) and acceleration due to gravity (g) are constants that can be obtained if not given in the problem.

For this particular problem, you will also need to know the specific configuration of the pendulum as shown in Figure 15-41. It describes a system where three sticks are joined together, forming a compound pendulum. However, I cannot visualize the figure without an image or more information about the configuration.

Considering this, it would be best to consult your physics textbook, professor, or a tutor who may be able to provide you with the necessary details regarding the moment of inertia and the distance. With that information, you can substitute the values into the formula and calculate the period of oscillation of the pendulum.