Thermodynamic law
First law of thermodynamics- a . The heat and mechanical work are mutually convertible. According to this law when a close system is undergoes a thermodynamic cycle. The net heat transfer is equal to the work transfer. In other words, the cycle integral of work transfers. Mathematically, Cycle integral of δQ = cycle integral of δW b. The energy can neither be created nor destroyed throught it can be transformed from one form to another . Heat transfer and work transfer take place . The net energy transfered to stored within the system and is known as stored energy or total energy of the system. Cycle integral of δQ−δW= dE Now integrating Q1-2 - W1-2= E2- E1 For unit mass q1-2- w1-2= e2-e1 E1= total energy of the system at state 1 = PE1+ KE1+U1=mgz1+(mv1/2)2 +U1 E2=PE2+KE2+U2=mgz2+(mv2/2)2+u2