Q4. (20 marks) A mass of ice at -15.0°C in a very light container receives heat at the constant rate of 800.0 J/min. Spe

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Q4 20 Marks A Mass Of Ice At 15 0 C In A Very Light Container Receives Heat At The Constant Rate Of 800 0 J Min Spe 1 (84.13 KiB) Viewed 55 times

Q4. (20 marks) A mass of ice at -15.0°C in a very light container receives heat at the constant rate of 800.0 J/min. Specific heat capacity of ice: 2.01 x 10° J.(kg.K)', latent heat of fusion of ice: 3.34 x 10ʻJ/kg. The ice starts to melt after 20.8 minutes. (a) Find the mass of the ice in the container. (b) After how many minutes, from the time when the heating is first started, does the temperature begin to rise above 0.0°C? (c) Plot a diagram showing the change of temperature as a function of the time. Explain clearly each stage of all the process. Q5. (20 marks) A hollow cylinder with a length of L = 50 cm, an inner radius of a = 4.0 cm, and an outer radius of b = 8.0 cm must have the interior temperature at (a = 10°C while the outside temperature is T. = 35°C. The wall of this cylinder has thermal conductivity k. The rate of heat conduction is P = 0.20 W. (a) Demonstrate that the rate of heat conduction is computed by the formula: P=21Lk To-T In(b/a) (b) Find the numerical value of the thermal conductivity k. a