Calculate the efficiency of a bicycle if the input work to turn the pedal is 45j and the output work is 20j. * 1 point 2.25 2.25% 44 44.4%

Use the right-hand rule for magnetic force to determine the charge on the moving particle. this is a charge.

Explain the comparisons between nature and packingtown that appears on pages 81 and 82 answer

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 =