You push a heavy crate out of a carpeted room and down a hallway with a waxed linoleum floor. while pushing the crate 2.5 m out of the room you exert a force of 385 n; while pushing it 10 m down the hallway you exert a force of 130 n. to slow it down you exert a force of 350 n through a distance of 2.0 m, opposite to the motion. how much work do you do in all?

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 =