Question

 The figure (Figure 1) shows a model of a crane that may be mounted on a truck. A rigid uniform horizontal bar of mass m1 = 90.0 kg and length L = 5.80 m is supported by two vertical massless strings. String A is attached at a distance d = 1.80 m from the left end of the bar and is connected to the top plate. String B is attached to the left end of the bar and is connected to the floor. An object of mass m2 = 2500 kg is supported by the crane at a distance x = 5.60 m from the left end of the bar.

 Throughout this problem, positive torque is counterclockwise and use 9.80 m/s- for the magnitude of the acceleration due to gravity.

 Part A

 Find T_A, the tension in string A.

 Part B

 Find T_B, the magnitude of the tension in string B.

Answer 1

Find the tension in the two strings using the vertical and rotational equilibrium of the bar as shown below