Astudent needs to measure the drag on a prototype of characteristic length dp moving at velocity up in air at sea-level conditions. he constructs a model of characteristic length dm, such that the ratio dp/dm = a factor f. he then measures the model drag under dynamically similar conditions, in sea-level air. the student claims that the drag force on the prototype will be identical to that of the model. is this claim correct? explain.

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