2. A 70.0-g aluminum calorimeter contains 390 g of water at a temperature of 20°C. Then a 160-g piece of metal, initially at 271°C, is added to the calorime temperature of 32°C. What is the specific heat capacity of the metal? The specific heat capacity of aluminum is 910 J/kg - K, and of water is 4190 J/kg
490 J/kg.
408 J/kg K
O 360 J/kg.
588 J/kg-K
533 J/kg-K

The ratio of lift to drag l/d for a wing or airfoil is an important aerodynamic parameter, indeed, it is a direct measure of the aerodynamic efficiency of the wing. if a wing is pitched through a range of angle of attack, l/d first increases, then goes through a maximum, and then decreases. consider an infinite wing with an naca 2412 airfoil. estimate the maximum value of l/d. assume that the reynolds number is 9x10^6.