Consider a hot dog to have the following dimensions and properties: diameter = 20 mm, cp = 3.35 kj/kg⋅k, rho = − 880 kg/m3, and k = 0.5 w/m⋅k. for the hot dog initially at 5 c, exposed to boiling water at 100 c, with a surface coefficient of 90 w/m2⋅k, what will be the cooking time if the required condition is for the center temperature to reach 80 c?

Explain the difference laminar and turbulent flow. explain it with the shear stress and the velocity profiles.

Slip occurs via two partial dislocations because of (a) the shorter path of the partial dislocation lines; (b) the lower energy state through partial dislocations; (c) the charge balance.

Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.