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The following diagram shows the path of a planet around the Sun. Kepler discovered that _.
1. area A = area C.
2. the distance from P2 to P3 equals the distance from P5 to position P6
3. the speed in the interval from P4 to be P5 equals the speed in the intervals from P6 to P1
4. the speed on the interval from P4 to P5 is greater than the speed in the interval from P1 to P2
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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 =