21. Frank Enstein delivered his newspapers one evening. To deliver his newspapers, Frank traveled 3 blocks East, then 2 blocks North, then 3 blocks West, then, finally, 2 blocks South
What Frank's displacement? Hint: It may be helpful to draw this out.

Which simple machine is not part of this compound machine? a. lever b. pulley c. inclined plane d. wheel and axle

What is the measurement of how fast an object moves relative to a reference point?

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 =