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A hot water pipe is made of 1 inch OD copper and is at a temperature (at the surface) Of 120F. The ambient temperature is at 70F. We want to reduce the heat loss from the pipe by adding foam insulation of thickness 0.5 inches and thermal conductivity k=0.025W/mK. If the external heat transfer coefficient is 18 W/m2K, what is the ratio of the heat loss with insulation to that without? Assume that the external heat transfer coefficient is the same in both cases, and there is no internal heat transfer resistance. There is insufficient information to answer the question. 0.146 1.0 0.85 0.0014 For the slab in question 2 , what is the ratio of the centerline temperature to the average temperature in the slab? 1 There is insufficient information to answer the question. 3/2 2