Douglas Burke

Physics

5 April, 15:57

Drawbridges, such as this one at the Tower of London, are raised and lowered by cable systems. Now consider the drawbridge illustrated below wherein the nearly horizontal brown door is centered along the vertical brick wall, the door-wall angle is α = 85 o as measured relative to the black hinge axis, the tension (magnitude) in each cable is T = 500 N and the relevant dimensions are a = 360 cm, b = 100 cm, c = 520 cm and d = 390 cm. Determine the resultant torque (magnitude) | (M R) a x i s | in Nm that the two cables contribute to the moment about the hinge axis.