The following data has been gathered by another lab group. Analyze the data using your graph as the template. Can you detect an experimental error in the group's data? Length (m) Period (s)

0.80 0.94

0.60 0.78

0.50 0.75

0.30 0.56

0.10 0.38

What belongs in the areas marked x and y? x: the internal energy of a piston system increases as heat is added and rises to a cool area y: as thermal energy is added to a container, some of the energy is lost to the environment x: as thermal energy is added to a container, some of the energy is lost to the environment y: the internal energy of a piston system increases as heat is added and rises to a cool area x: a cold spoon placed in hot liquid gets warmer y: thermal energy is converted to light energy x: thermal energy is converted to light energy y: a cold spoon placed in hot liquid gets warmer