A car with a mass of 1,500 kg requires a centripetal force of 640 N to safely follow a circular curve in the road at 13. 4 m/s. What is the radius of the curve? 31 m 77 m 421 m 860 m.

Consider the growth of a 20-nm-diameter silicon nanowire onto a silicon wafer. the temperature of the wafer surface is maintained at 2400 k. assume the thermal conductivity of the silicon nanowire is 20 wm-1k-1 and all its surfaces including the tip are subjected to convection heat transfer with the coefficient h = 1×105 wm-2k-1 and t∞ = 8000 k. when the nanowire grows to l = 300 nm, what is the temperature of the nanowire tip (t (x =