In an annealing (heat treatment) process, copper rods ( = 8933 kg/m3 , k = 401 W/m ∙ K, c = 385 /kg ∙ K, = 1.17 × 10−5m2 /s) with a radius of 0.05 meters are treated by drawing them through an industrial high temperature furnace. The gases ( = 0.4213 kg/m3 , k = 0.08491 W/m ∙ K, c = 1292 /kg ∙ K, = 1.56 × 10−4m2 /s) in the furnace are maintained at 1300K. The heat transfer coefficient in the furnace is 150W/m2 ∙ K. The copper rods enter the furnace at a uniform temperature of 350K throughout the rods.

We want to calculate the total metabolic heat generated by a singing canary taking into account heat transfer by radiation, convection and exhaling air. the air temperature is 20 oc, canary’s body internal and surface temperature is 33oc, external body surface convective heat transfer coefficient is 25.2 w/m2 .k, temperature difference between the inhaled and exhaled air is 4.3 oc, the ventilation rate is 0.74 cc of air per second, specific heat of air is 1.0066 kj/kg. k and density of air is 1.16 kg/m3 . assume the canary’s body to be a cylinder with 7 cm diameter and 9 cm length, and heat exchange is from the side as well as the top and bottom of cylinder. calculate 1) the net rate of heat lost by radiation, assuming heat gained by the bird through radiation from the surroundings is 11.5 w; 2) rate of heat transferred by convection to the surrounding air; 3) rate of heat transferred in the exhaling air without considering any internal evaporation; 4) total metabolic power.

Akg a of 55 m at an of 11 ? . if is at 98 km/h, be ?

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?