Which of the following statements is/are true about typical metals (mark all that apply): a. for a pure metal (not an alloy), solidification takes place over a range of temperatures. b. typical metal samples with millions of small grains have isotropic material properties. c. grain boundaries form where growing grains of different orientation meet d. unit cells are smaller than grains

Ahot wire operates at a temperature of 200°c while the air temperature is 20°c. the hot wire element is a tungsten wire of 5 um diameter and 2 mm in length. plot using excel current, heat transfer and heat generated by the wire for air velocity varying from 1-10 m/s in steps of lm/s? matlab the sensor voltage output, resistance, or assume nu 0.989 re033pr13 take air properties at tr (200°c20°c)/2 = 110°c properties of tungsten: c 0.13 kj/kg.k 3 p 19250 kg/m k (thermal conductivity) = 174 w/m.k