The value of the temperature gradient in the glass at the water-glass interface in K/m is

Question

Common data for Question 01 & 02

Heat is being transferred by convection from water at 48⁰C to a glass plate whose surface that is exposed to the water is at 40⁰C. the thermal conductivity of water is 0.6 W/mK and the thermal conductivity of water is 0.6 W/mK and the thermal conductivity of glass is 1.2 W/mK. The spatial gradient of temp in the water at the water glass interface to dT/dy = 1 ´ 10⁴ K/m

1. The value of the temperature gradient in the glass at the water-glass interface in K/m is                                                         

      (a) –2 $\times$10⁴                                                         (b) 0.00

      (c) 0.5 $\times$ 10⁴                                                              (d) 2 $\times$ 10⁴

 

      2. The heat transfer coefficient h in W/m² K is                                

      (a) 0.0                             (b) 4.8                          (c) 6                                (d) 750