PhysicsCase 1: Traffic LightA traffic light is hanging from two wires set at known angles. What is the magnitude of the tension in each wire?
Show AllCase 1 Example 1! ”Show AllCase 1 Example 2! ”Case 2: Painters on a ScaffoldTwo painters with different masses are standing on a scaffold of a certain length and different distances from each end. The cables supporting the scaffold are vertical and attached to each end. What is the tension in each cable?Set up this system based on the figure using a meter stick or yard stick. Tie two strings about 50 cm long to each end of the stick. The other end of each string should have a loop in it for attaching the spring scale.Tie or hang two objects with different masses from two points on the stick. The locations should be chosen so that the system is not symmetrical (not the same distance from each end of the stick). Hold the strings so that the stick is horizontal.Record the distances, masses, and the mass of the stick (usually around 100 grams) on the Report Sheet. Solve for the tension in each string.You can set the system down while you are doing this, or you can immediately measure the two tensions before doing the calculation. In either case, when measuring the tensions make sure the stick is horizontal.Carefully attach the spring scale to the loop of one string by holding the loop with the hook, making sure that the spring scale is vertical and the stick remains horizontal.Record the tension, T 1, on the Report Sheet. Repeat this procedure for the other string, recording the second tension, T2, on the Report Sheet. Compare the calculated tensions with the experimental values measured by the spring scale.Note: all angles between applied forces and the horizontal stick are 90 degrees.Show AllCase 2 Example 1! ”Show AllCase 2 Example 2! ”Case 3: The Angled BoomA crate is hanging from a boom set at a certain angle and held in place by a horizontal cable. What is the tension in the cable?Set up this system based on the figure. Tie a string about 50 cm long (the ‘cable’) from a point on a meter stick around 5 cm from the end. The other end of each string should have a loop in it for attaching the spring scale. Hang a mass from a short string tied to some point on a meter stick (the green block in the figure). Anchor the pivot point of the stick (the lower end on the left side of the figure) to a flat surface. Hold the longer string horizontally and choose an angle θ. Angles of 30, 60 or 45 degrees can make the calculations easier.Record the distances to the two attachment points from the pivot point, as well as the mass of the hanging object and the angle of the stick on the Report Sheet. Solve for the tension in the horizontal string.You can set the system down while you are doing this, or you can immediately measure the tension in the horizontal string before doing the calculation. In either case, when measuring the tension make sure the string is horizontal and the angle of the stick is the same as in the original position.Attach the spring scale to the loop in the horizontal string and record the tension on the Report Sheet. Compare the calculated tension with the experimental value measured by the spring scale.

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