Question

The equation AU = Q - W describes which one of the following?

Answer 1

Answer:

D. First law of thermodynamics

Explanation:

The first law of thermodynamics refers that energy can be tranferred or changed form one form to another but it can neither be destroyed nor be created. hence, it is also known as law of conservation of energy.

The equation  ΔU = Q − W describes the first law of thermodynamics.

Where

• U is the internl energy of the system.                                  
• ΔU is the change in U.                                                          
• Q refers to the total heat supplied into the system (include both addition and release of energy in the system).              
• W is the net work done by the system.

Hence, the correct option is D.

Answer 2

Answer:

Option D, First law of thermodynamics

Explanation:

The first law of thermodynamics states the following -

$dU = Q-W$

where dU  represents the Heat added to the System

Q represents the Change in Internal Energy OR net heat transfer OR sum of all heat transferred into and out of the system

W represents the Work done on the system

The first law of thermodynamics is based on the application of the conservation of energy principle to heat and thermodynamic.  

hence, option D is correct