Alight, inextensible cord passes over a light, frictionless pulley with a radius of 8.3 cm. it has a(n) 19 kg mass on the left and a(n) 3.1 kg mass on the right, both hanging freely initially their center of masses are a vertical distance 3.4 m apart. the acceleration of gravity is 9.8 m/s2 at what rate are the two masses accelerat- ing when they pass each other?

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 =