State whether the following statements are true or false. If flase, correct it. 1) Force has magnitude as well as direction.
2) Friction does not produce heat.
3) The unit of frequency is decibel.
4) The copper rod can be charged by friction, if held by hand.
5) The angle is sometimes equal to angle of reflection.
6) Mars is also called as the red planet.
7) Seminal vesicles is a part of female reproductive system.​

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 =