Only #2 and how u got the answer please For a composite rod like shown above inDiscussion Question 6, each section has length0.75 m and a cross-sectional area 4 cm2.a) Find the temperature at the midpoint of thecomposite rod.Suppose that the thermal conductivities ofwood and metal are kw =1 and km = 14, inMKS units.b) Find the rate of heat flow across the compositerod.2. A container of water has been outdoors in coldweather until a 5.0-cm thick slab of ice hasformed on its surface. The air above the ice iskice = 1.7 W/m KPice = 0.92 g/cm3Laice = 333 kJ/kgData:at -10°C.Assume that the walls of the container areCalculate the rate of formation of ice (incm/hr) on the bottom surface of the slab.thermally insulating.

Given Thickness (y) = 5 cm =0.05 m Temperature = -10°C =θ°--10° = 10° C Kice = 1.7 W/m.kρice = 0.92 g/cm3 = 920 kg/m3Lf,ice = 333 KJ/Kg =333×1000 J/Kg If the area of the container is A, heat escaping through ice in time dt is, dQ1 =KAθ dtyHere,θ = temperature difference and wall of container is thermally insulated The thickness of the ice-layer is increased by dy amount in dt time, dQ2 = mL =ρ dy A Lm = mass of the increased ice =ρice ×dy×A Hence,dQ1 = dQ2dydt = Kiceθρice Lf,ice y = 1.7 W/m.k×10°C920×kg/m3×333×1000 J/kg×0.05 m =1.1098×10-6 m/s =1.1098×10-6 ×100 cmhr×3600 = 0.399528 cm/hrTherefore, the rate of formation of ice is 0.399528 cm/hr.

Science

Advanced Physics

2. A container of water has been outdoors in cold weather until a 5.0-cm thick slab of ice has formed on its surface. The air above the ice is at -10°C. Data: kice = 1.7 W/m K Pice = 0.92 g/cm3 Lejce = 333 kJ/kg Assume that the walls of the container are Calculate the rate of formation of ice (in cm/hr) on the bottom surface of the slab. thermally insulating.

2. A container of water has been outdoors in cold weather until a 5.0-cm thick slab of ice has formed on its surface. The air above the ice is at -10°C. Data: kice = 1.7 W/m K Pice = 0.92 g/cm3 Lejce = 333 kJ/kg Assume that the walls of the container are Calculate the rate of formation of ice (in cm/hr) on the bottom surface of the slab. thermally insulating.