5. A light metre rule is allowed to pivot freely at the zero end. The other end supported by a spring balance. A weight of 200N is then hung at the 40crs mark. The metre rule
stays horizontal, What is the reading on the spring balance?

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 =