1ai. a steel bar 10.0 cm long is welded end-to-end to a copper bar 20.0 cm long. Both bars are insulated perfectly on their sides. Each bar has a square cross-section, 2.00 cm on a side. The free end of the steel bar is maintained at 1000C by placing it in contact with steam, and the free end of the copper bar is maintained at 00C by placing it in contact with ice.(ii)Calculate the temperature at the junction of the two bars.Suppose the two bars are now separated, with both ends of each of the bars now maintained at 1000C and 00C respectively, determine the total rate of heat flow in the two bars.b. If the total surface area of the human body is 1.20 m2 and the surface temperature is 300C,Determine the total rate of radiation of energy from the body.If the surroundings are at a temperature of 200C, calculate the net rate of heat loss from the body by radiation?[Hint: the emissivity of the body is very close to unity, irrespective of skin pigmentation, ] c.You place a small piece of melting ice in your mouth. Eventually, the water all converts from ice at T1 = 32.000F to body temperature, T2 = 98.600F.Express these temperatures as 0C and K.determine ΔT in both cases. 2a. A 100 kg steel support rod in a building has a length of 2.0 m at a temperature of 200C. The rod supports a load of 6000 kg. Calculate thei. work done by the rod as the temperature increases to 400C,ii. heat added to the rodchange in thermal energy of the rod.[448 J/kg/0C, b. A glass flask with volume 200 cm3 is filled to the brim with mercury at 200C. Determine the amount of mercury that overflows when the temperature of the system is raised to 1000C? [] c. A geologist working in the field drinks her morning coffee out of an aluminium cup. The cup has a mass of 0.120 kg and is initially at 200C when she pours in 0.300 kg of coffee initially at 700C. Determine the final temperature after the coffee and cup attain thermal equilibrium? [ccoffee = 4190 caluminium = 910 J/kg/K]

1ai. a steel bar 10.0 cm long is welded end-to-end to a copper bar 20.0 cm long. Both bars are insulated perfectly on their sides. Each bar has a square cross-section, 2.00 cm on a side. The free end of the steel bar is maintained at 1000C by placing it in contact with steam, and the free end of the copper bar is maintained at 00C by placing it in contact with ice.(ii)Calculate the temperature at the junction of the two bars.Suppose the two bars are now separated, with both ends of each of the bars now maintained at 1000C and 00C respectively, determine the total rate of heat flow in the two bars.b. If the total surface area of the human body is 1.20 m2 and the surface temperature is 300C,Determine the total rate of radiation of energy from the body.If the surroundings are at a temperature of 200C, calculate the net rate of heat loss from the body by radiation?[Hint: the emissivity of the body is very close to unity, irrespective of skin pigmentation, ] c.You place a small piece of melting ice in your mouth. Eventually, the water all converts from ice at T1 = 32.000F to body temperature, T2 = 98.600F.Express these temperatures as 0C and K.determine ΔT in both cases. 2a. A 100 kg steel support rod in a building has a length of 2.0 m at a temperature of 200C. The rod supports a load of 6000 kg. Calculate thei. work done by the rod as the temperature increases to 400C,ii. heat added to the rodchange in thermal energy of the rod.[448 J/kg/0C, b. A glass flask with volume 200 cm3 is filled to the brim with mercury at 200C. Determine the amount of mercury that overflows when the temperature of the system is raised to 1000C? [] c. A geologist working in the field drinks her morning coffee out of an aluminium cup. The cup has a mass of 0.120 kg and is initially at 200C when she pours in 0.300 kg of coffee initially at 700C. Determine the final temperature after the coffee and cup attain thermal equilibrium? [ccoffee = 4190 caluminium = 910 J/kg/K]