Practice question · Select all that apply
Which statements about the first law are correct?
Hints
- Three are the content of the law; one misstates what is conserved.
- It is the SUM of heat and work that is path-independent, not either alone.
Show the answer
- A. The law forbids a machine that produces work from nothing
- C. Internal energy is a state function
- D. Heat and work are individually path-dependent
Why
The law’s content is that the combination is path-independent even though neither term is. Nothing conserves heat or work separately, a fact the caloric theory got wrong.
Practise The First Law and Heat Capacities
The app has 5 more questions on this lesson, and keeps your place in the course. Physics II is free to start.
More questions on The First Law and Heat Capacities
- One mole of a monatomic ideal gas has CV = 12.47 J/mol/K. Compute its CP in J/mol/K, using R = 8.314 J/mol/K,…
- Why is CP always larger than CV for a gas?
- An adiabatic expansion leaves the temperature of an ideal gas unchanged.
- A gas absorbs 800 J of heat while doing 300 J of work on its surroundings. Compute the change in its internal…
- Internal energy U is a state function whereas heat Q and work W are path-dependent. What is the fundamental…
- An ideal gas absorbs 600 J of heat during an isothermal expansion. Set the work it does on its surroundings,…