Question

A flagpole weighs 53kg with a flag. The flagpole is 8.4 m long. The flagpole is attached to the wall partly at point A and partly with a horizontal line extending from the top end of the flagpole. The center of gravity of the flagpole and flag is in the bar 5.0 m from the point A. The angle between the bar and the wall is 45 degrees as the figure shows.
Determine the power of the cable.

Answer 1

Taking moment around point A for the stability of the bar,

$mg\sin(45) \times AB=T\sin(45) \times AC\\ 53g\times\sin(45)\times 5\times \sin(45) \times8.4\\ T=61.89N$