Which observations correctly describe the second law of thermodynamics? Check all that apply.Thermal energy that is not used to do work is often released to the surroundings.Thermal energy flows from a cooler object to a warmer object.Thermal energy flows from a warmer object to a cooler object.Thermal energy is released as unusable energy by a heat engine, which is never 100 percent efficient.Thermal energy flows when two objects in contact have a temperature difference.
Answer
A
Thermal energy that is not used to do work is often released to the surroundings.
B
Thermal energy flows from a cooler object to a warmer object.
C
Thermal energy flows from a warmer object to a cooler object.
D
Thermal energy is released as unusable energy by a heat engine, which is never 100 percent efficient.
E
Thermal energy flows when two objects in contact have a temperature difference.