otes: L The total energy of the system (E) is equal to the sum of the above three types of energies. In the study of thermodynamics, we are mainly concerned with the change in internal energy (dU) which depends upon the change in temperature of the system. It is the energy possessed by a body or a system due to its molecular arrangement and motion of the molecules. When m is in"kg and Vis in m/s, then kinetic energy will be in N-m, as discussed below: We know that kinetic energy, 1 m2 kg-m 2 KE= -mV = kgx-2 =2-xm =N-mģ.11Wrnal eurgJ. Let m = Mass of the body, and V = Velocity of the body. It is the energy possessed by a body or a system, for doing work, by virtue of its mass and velocity of motion. (b) When m is in kg and z in metres, then the potential energy will also be in N-m, as discussed below: We know that potential energy, 1 PE = m g z = kg x X m =N-m. Potential energy, PE = W z = m g z It may be noted that (a) When Wis in newtons and z in metres, then potential.energy will be in N-m. Let W Weight of the body, m Mass of the body, z Distance through which the body falls, and g = Acceleration due to gravity= 9.81 m/s2 For example, a body raised to some height above the ground level possesses potential energy because it can do some work by falling on earth's surface. It is the energy posse~ed by a body or a system, for doing work, by virtue of its position above the ground level. HiJio)llll &Distributors, Booksellers &Pubhohers ATcxtbookOfRcfrigcratlonA5aeed Book Bank lEW DELHI- 110055 S Kh KHURMI J.K.GUPTAĮURASIA PUBLISHING HOUSE (P) LTD.
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