Consider a football coach pacing back and forth along the sidelines. The diagram below shows several of the coach's positions at various times. At each marked position,
the coach makes a "U-turn" and moves in the opposite direction. In other words, the
coach moves from position A to B to C to D. What is the coach's resulting displacement
and distance traveled?
Displacement =
Distance traveled =

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 =