Besides Joule's Classic Experiment,another Way of Demonstrating the Equivalence Between

question 85

Multiple Choice

Besides Joule's classic experiment,another way of demonstrating the equivalence between mechanical energy and heat is the following: Put some lead shot into a glass tube,seal both ends of the tube,invert the tube quickly several times,and measure the temperature of the shot.If you assume that all the mechanical energy is converted into heat in the lead shot and that no heat is lost,what is the change in the temperature of the shot if the tube is 1.0 m long,there are 100 g of shot,and the tube is inverted 10 times? (The specific heat of lead is 0.128 kJ/kg · K.)

• A)0.77 Cº
• B)0.077 Cº
• C)2.5 Cº
• D)7.7 Cº
• E)0.25 Cº

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