A glass of cold lassi placed on a kitchen counter eventually warms to room temperature. The second law of thermodynamics says:
AThe lassi could spontaneously cool further at any time
BHeat naturally flows from the warm room to the cold lassi
CHeat flows from cold lassi to warmer room without any work
DThe lassi can never reach room temperature without help
Answer & Solution
Correct answer: B. Heat naturally flows from the warm room to the cold lassi
By the second law, heat naturally flows from hot (room) to cold (lassi) until equilibrium.
Related questions
Which of the following is a reversible process in the thermodynamic sense?A refrigerator extracts 600 J from the cold compartment and rejects 800 J to the room. ItsFor an ideal gas the adiabatic equation linking pressure and volume is:A Carnot engine operates between 400 K and 300 K. If it absorbs 800 J from the hot reservoThe change in internal energy of an ideal gas (γ = 1.4) when 2 moles are heated from 300 KThe second law of thermodynamics can be stated as: no engine can convert into work:The Carnot engine's efficiency between source temperature T₁ (hot) and sink T₂ (cold) is:An ideal gas at temperature T₁ is expanded adiabatically. Its final temperature T₂ is: