When a rocket is launched, it carries a heavy load of fuel, which is burned during the ascent. the force needed to produce a given acceleration just off the launching pad is f1. the force needed to produce the same acceleration a few minutes after launch is f2. what relationship would f1 and f2 have?

Suppose while hauling rocks, you accidentally drop one. it breaks apart in flat, planar sections. what type of rock did you just drop? 20 points

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 =

Why do different substances have diffrent properties