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Water (specific heat, $c_p$ = $4.18$ $kJ$/$kgK$) enters a pipe at a rate of $0.01$ $kg$/$s$ and a temperature of $20^0$ $C$.The
pipe, of diameter $50$ $mm$ and length $3$ $m$, is subjected to a wall heat flux ${q_{w}}''$ in $W$/$m^2$:

If $W$ ${q_{w}}''$ = $5000$ and the convection heat transfer coefficient at the pipe outlet is $1000$ $W$/$m^2$$K$, the
temperature in $_{}^{0}\textrm{C}$  at the inner surface of the pipe at the outlet is

  1. $71$
  2. $76$
  3. $79$
  4. $81$
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