A 73-kg cross-country skier glides over snow as in the figure below. The coefficient of friction between skis and snow is 0.23. Assume all the snow beneath her skis is at 0°C and that all the internal energy generated by friction is added to snow, which sticks to her skis until it melts. How far would she have to ski to melt 2.5 kg of snow? The snow is already at the melting temperature of 0°C so the energy Q that must be added to convert a kilogram of snow into liquid water at 0°C is given by the following equation, where m is the mass to be converted and LF is the latent heat of fusion of water. Q  =  mLf = (2.5 kg) (3.33 x 10^5 J/kg) = ____________ x 10^5 J

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First law of Thermodynamics

The word thermodynamics consists of two words: thermo- and dynamics. Dynamics means the study of motion. The field of thermodynamics is all about the study of the movement of heat. In a more meaningful way, it is stated as the study of the transfer of energy. Energy transfer is something that we encounter in day-to-day life. Automobiles, chemical reactions, refrigerators, and power generators work on the basis of thermodynamic principles.