The engine in a small airplane is specified to have a torque of 500 n⋅m . this engine drives a 2.4- m -long, 40 kg single-blade propeller. on startup, how long does it take the propeller to reach 2000 rpm ?

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 =