Air at 1 atm and 20°c is flowing over the top surface of a 0.2 m 3 0.5 m-thin metal foil. the air stream velocity is 100 m/s and the metal foil is heated electrically with a uniform heat flux of 6100 w/m2. if the friction force on the metal foil surface is 0.3 n, determine the surface temperature of the metal foil. evaluate the fluid properties at 100°c.

Acylinder with a movable piston contains 11.7 moles of a monatomic ideal gas at a pressure of 1.32×10^5 pa. the gas is initially at a temperature of 300 k. an electric heater adds 43200 j of energy into the gas while the piston moves in such a way that the pressure remains constant. cp=20.79 j k^−1 mol^−1 for a monatomic ideal gas, and that the number of gas molecules is equal to avogadro's number (6.022×10^23) times the number of moles of the gas. (a) what is the temperature of the gas after the energy is added? (b) what is the change in volume of the gas? (c) how much work is done by the gas during this process?