You are a judge in a childrens kite-ying contest, and two

Chapter 4, Problem 4.22

(choose chapter or problem)

You are a judge in a childrens kite-ying contest, and two children will win prizes for the kites that pull most strongly and least strongly, respectively, on their strings. To measure string tensions, you borrow a weight hanger, some slotted weights, and a protractor from your physics teacher, and use the following protocol, illustrated in Figure P4.22: Wait for a child to get her kite well controlled, hook the hanger onto the kite string about 30 cm from her hand, pile on weight until that section of string is horizontal, record the mass required, and record the angle between the horizontal and the string running up to the kite. (a) Explain how this method works. As you construct your explanation, imagine that the childrens parents ask you about the method, that they might make false assumptions about your ability without concrete evidence,and that your explanation is an opportunity to give them condence in your evaluation technique. (b) Find the tension in the string if the mass is 132 g and the angle is 46.3.