A 500 kg piano is being lowered into position by a crane while two people steady it with ropes pulling to the sides. Bob's rope pulls to the left, 15 degrees below horizontal, with 500 N of tension. Ellen's rope pulls toward the right, 25 degrees below horizontal. What is the tension in the main cable supporting the piano? I found that the tension in Ellens rope was 533 N but I have no idea how to figure out the tension force in the main cable...can anybody help??