QUESTION 1 An iron rod used in the support structure of a building is 8.50 m long at room temperature (20.0 degrees Cj. How much longer is it when it is brought to a temperature of 85.0 degrees C? Take the coefficient of linear expansion of iron to be 1 1 x 10 - 1/0 QUESTION 2 A bottle containing 4.25 kg of water at a temperature of 21 2 degrees Celsius is placed in a refrigerator where the temperature is kept at 3.84 degrees Celsius. How much heat is transferred from the water to cool it to 3.84 degrees Celsius? The specific heat capacity of water is 4180 J/kg*C QUESTION 3 An aluminum pizza pan of mass 1.67 kg is initially at a room temperature of 18.5 degrees Celalus. The pan is then placed in the oven to be used for cooking a pizza. Once inside the oven. the pan reaches a temperature of 275 degrees Celsius. If the heat trasferred from the over to the aluminum pan is 387000 J. find the value of the specific heat capacity of aluminum. QUESTION 4 What is the maximum efficiency that a heat engine could have when operating between the normal boiling and freezing temperatures of water? QUESTION 5 As a gasoline engine is running, an amount of gasoline containing 15,000J of chemical potential energy is burned in 1 s. During that second, the engine does 3,000 J of work. (a) What is the engine's efficiency? (Give you answer as a percentage value, but without the percentage sign, or else blackboard will not recognize it. For instance, if you calculate it to be 83.4%, just write 83.4) QUESTION 6 As a gasoline engine is ninning. an amount of gasoline containing 15.000J of chemical potential energy is burned in 1 s. During that second, the engine does 3 000 J of work. (b) The burning gasoline has a temperature of about 2500 K. The waste heat from the engine flows into air at about 300 K. What is the Camnot efficiency of heat engine operaling between these two temperatures? (Give yor answer as a percentage value, but without the percentage sign. or else blackboard will not recognize it. For instance, if you calculate it to be 83.4%, just write 83.4) QUESTION 7 Imagine that a high-efficiency heat engine could be created that operated between the lot and high temperatures of -50.5 degrees celsius and 5550 degrees celsius. What would be the maximum efficiency of such an engine? (Give yor answer as a percentage value, but without the percentage sign, or else blackboard will not recognize t. For instance, if you calculate it to be 83.4%, just write 83.4)
