An 80.0 N force accelerates a 6.0 kg object from 4.0 m/s to 8.0 m/s. What is the impulse?
0 24 N"s
0 3.33 Nºs
30 N's
0 -30 N's
0-24 N's

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 =