Approximately how long should it take 8.2 kgkg of ice at 0∘C∘C to melt when it is placed in a carefully sealed Styrofoam ice chest of dimensions 25 cmcm ×× 35 cmcm ×× 55 cmcm whose walls are 1.2 cmcm thick? Assume that the conductivity of Styrofoam is double that of air and that the outside temperature is 28 ∘C∘C.

Why is alternating current more effective at long–distance travel than direct current? a. the power lines are made out of conductors. b. transformers increase or decrease voltage as needed. c. the ac generator is more efficient. d. ac has lower voltage than dc.

Use the profile illustrated for problem (1). assume that the layer of silty sand fill (sm) is placed over the entire site. estimate the thickness of the fill (h - in feet) that will cause the effective vertical stress at the center of the clay layer to increase by 517.5 pounds per square foot.

Asmall electric heater, immersed in 80g of water in a calorimeter of 40j/k raises the temperature from 10.5 degree celsius to 25 degree celsius in 12 minutes. using the same apparatus with 50g of oil instead of water, it is found that the temperature of oil rises from 7 degree celsius to 27 degree celsius in 10 minutes. find specific heat capacity of the oil.