C. It is thrice the value as the coefficient of thermal expansion D. Cannot be determined 48. A copper bar is 80 cm long at 15 °C. What is the increase in length when it is heated to 35 °C? The linear expansion coefficient for copper is 1.7 x 10-5 °C·'. A. 2.5x10-4 m B. 2.6x10¬4 m C. 2.7x10¬4 m D. 2.8x10-4 m

Choose the correct answer 1. You have a 90 cm long iron rod at 15 ° C that heats up to 300 ° C. What happens with the rod is that: A. It melts. B. Double the length. C. Decrease its length a few centimeters. D. Increase its length by a few millimeters. 2. A student blows up a balloon and places it in his home freezer. After a long time, the balloon is removed from the freezer and it is observed that: A. The volume decreases as a certain amount of air escapes. B. It remains the same, because the air inside it does not expand or contract. C. The volume increases, because the air inside it expands D. The volume decreases as the air inside it contracts

A typical person takes 12 breaths a minute, with each breath drawing in 0.500 L of outside air. If the air warms up from -10 °C to 30 °C. A. What is the volume of air exhaled with each breath? B. How many moles of air are exhaled? C. What is the heat transfer needed to warm each breath? Molar mass air = 29g/mol. Specific heat (air) = 721 J/(kg•°C) D. What is the rate of heat transfer?