Consider the common situation in which a researcher is trying to match the reynolds number of a large prototype vehicle with that of a small-scale model in a wind tunnel. compare the wind tunnel air at 10°c and at 45°c, all else being equal. for air at atmospheric pressure and at t = 10oc, rho = 1.246 kg/m3 and μ = 1.778×10-5 kg/m·s. at t = 45oc, rho = 1.109 kg/m3 and μ = 1.941×10-5 kg/m·s.

You have two photos of a person walking. one shows the person at the corner of third and main streets, the other shows the person at the corner of tenth and main streets. there are lampposts at every corner in this town, and the first picture shows it to be 10: 32: 00 exactly. the second picture shows it to be 10: 49: 30. you know three facts: (1) all of the clocks are synchronized; (2) there are exactly 12 equal-sized blocks per kilometer in this town; and (3) the streets that cross main in this area are numbered consecutively, with no interruptions. what is the person’s average speed in kilometers per hour?