Question

The wind-chill index W is the percelved temperature when the actual temperature is T and the wind speed is v, so we can write W RT, v). Wind speed (km/h) u | 20 | 30 | 40 | 50 | 60 | 70 1018 202 2 2323 -15-24 2627 29 3030 a2030 33-34 3637 44 -2537 3944243 (a) Estimate the values of f(-15, 50) and f/(-15, s0). (Round your answers to two decimal places.) f-15, 50) f-15, so)- What are the practical interpretations of these values? oC for every degree that the When the actual temperature is -15°C and the wind speed is 50 km/h, the apparent temperature Select- by about actual temperature rises. bout oC for every km/h that the wind When the actual temperature is -15°C and the wind speed is 50 km/h, the apparent temperature-Select speed increases by a (b) In general, what can you say about the signs of ow/aT and ow/av? For a fixed wind speed v, the values of the wind-chll index W Select- as temperature T increases, so V iSalect For a fixed temperature T, the values of w decrease (or remain constant) as v -Select-., so W s Select- ат dv (c) What appears to be the value of the following limit? lim dw

Answer 1

roninatiou e. know thab IS, 50) lim 2 1S,SD) S, 5 เอ 一丁0

lo 2. for a tixed temperotine T, the vel we as v tends to in Crcotse os o tixo me | n) te ndi to ·becomer, Constant or stalk, SD ov