Two bodies A and B are attached to the end of a string which passes over a pulley, so that they hang vertically. If the mass of the body B is 4 kg;
find mass of the body A which moves up with an acceleration of 0.5 ms
(Take g = 10 ms-2)
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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 =