When a 310-g piece of iron at 170 °C is placed in a 95-g aluminum calorimeter cup containing 250 g of liquid at 10°C, the final temperature is observed to be 37 °C. The value of specific heat for iron is 450 J/kg C°, and for aluminum is 900 J/kg Cᵒ. .
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- A steel bar 2 cm long is welded end to end to a copper bar 7 cm long. Each bar has a square cross section 2.00 cm on a side. The free end of the steel with a temprature at 63 °C, and the free end of the cooper bar is at 16 °C. Find the total rate of heat flow in (W)? (keteel -50.2 W/K.m and kcopper -385 W/K.m) (Answer in one decimal places) Materal having thermal conductivity k Area A Steel CopperAn insulated beaker with negligible mass contains 0.250 kg ofwater at 75.0°C. How many kilograms of ice at -20.0°C must be droppedinto the water to make the final temperature of the system 40.0°C?Calculate the rate of heat conduction through house walls that are 13.0 cm thick and that have an averane thermal conductivity of 0.027W/m"C. Assume there are no windows or doors. The surface area of the walls is 120m? and their inside surface is at 18.0°C, while their outside surface is at 5.00°C
- A steel bar 5 cm long is welded end to end to a copper bar 5 cm long, Each bar has a square cross section 2.00 cm on a side. The free end of the steel with a temprature at 50 °C, and the free end of the cooper bar is at 19 °C. Find the total rate of heat flow in (W)? (ksteel =50.2 W/K.m and kcopper 385 W/K.m ) (Answer in one decimal places) Material having thermal conductivity k Area A T. T. Steel СоpperA cylindrical metallic shell has inner radius r, =2 cm and outer radius r, = 4 cm and it has a length L = 50 cm. The inner and outer surfaces are maintained at T, = 0°C and T, = 100°C. The thermal conductivity of metal is 69.3 Wm¯'K. Find the rate of flow of heat %3D from the outer to the inner surface.A 295-g aluminum engine part at an initial temperature of3.00°C absorbs 85.0 kJ of heat. What is the final temperature ofthe part (specific heat of Al = 0.900 J/g·°C)?
- A square pane of glass 0.500 m on a side is 6.00 mm thick. Whenthe temperatures on the two sides of the glass are 25.0°C and -10.0°C,the heat current due to conduction through the glass is 1.10 * 10^3 W.(a) What is the thermal conductivity of the glass? (b) If the thickness of theglass is increased to 9.00 mm, what will be the heat current?The latent heat of vaporization of H,O at body temperature (37.0 °C) is 2.42 × 10ʻ J/kg. To cool the body of a 75-kg jogger [average specific heat capacity = 3500 J/(kg · C°)] by 1.5 C°, how many 63. kilograms of water in the form of sweat have to be evaporated?Long cylindrical AISI stainless steel rods (k =7.74 Btu/h·ft·°F and a = 0.135 ft2/h) of 4-in-diameter are heattreated by drawing them at a velocity of 7 ft/min through a21-ft-long oven maintained at 1700°F. The heat transfer coefficientin the oven is 20 Btu/h·ft2·°F. If the rods enter the ovenat 70°F, determine their centerline temperature when theyleave. Solve this problem using analytical one-term approximationmethod (not the Heisler charts).
- A coffee, with a temperature of 60 o C, is pour in a glass with diameter of 10 cm and height of 13 cm . The coffee has a continuous heat transfer of 60 W. What is the temperature (in Celsius) of the surface of the glass if convective heat transfer , h, is 50 W/m2-K?On a hot dry day, evaporation from a lake has just enough heat transfer to balance the 1.00 kW/m2 of incoming heat from the Sun. How many kg of water evaporate in 1.25h from each squre meter of the lake, You assume the latent heat of vaporization for water here is Lv= 2414kJ/kg m?A steel bar 6 cm long is welded end to end to a copper bar 9 cm long. Each bar has a square cross section 2.00 cm on a side. The free end of the steel with a temprature at 66 °C, and the free end of the cooper bar is at 5 °C. Find the total rate of heat flow in (W)? (ksteel =50.2 W/K.m and kcopper =385 W/K.m ) (Answer in one decimal places) Material having thermal conductivity k Area A Steel Сорper T,>T