Question

a bar suspended by two vertical strings

The figure shows a model of a crane that may be mounted on a truck.A rigid uniform horizontal bar of mass = 80.00 and length = 5.900 is supported by two verticalmassless strings. String A is attached at a distance = 1.000 from the left end of the bar and is connected to the top plate. String B is attached to the left end ofthe bar and is connected to the floor. An object of mass = 2000 is supported by the crane at a distance = 5.700 from the left end of the bar.
Throughout this problem, positive torque is counterclockwise. Use 9.81 for the magnitude of the acceleration due to gravity. What is the tension in string A?

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