2. HOW MUCH HEAT IS NEEDED TO CHANGE THE TEMPERATURE OF A 2 KG BLOCK OF COPPER FROM 10 DEGREES CELSIUS TO 140 DEGRESS CELSIUS? (THE SPECIFIC OF COPPER IS 390JOULE/KG C)

7. A cube of ice is taken from the freezer at -14 °C and placed in a 130 g aluminum calorimeter filled with 350 g of water at a temperature of 26 °C. The final situation is observed to be all water at 14 °C. What was the mass of the ice cube? (Cwater-4186 J/kg. °C, Cal 900 J/kg.°C, Cice-2000 J/kg. °C, L=3.35 × 10 J/kg) grams #3 80 F3 E $ 4 000 F4 R DE F % 5 F5 T ● G ^ 6 MacBook Air B F6 Y H & 7 F7 U N * 0 8 J DII F8 M 9 K 2 F9 O < L F10 P J F11 + F12 8 100 ? 1

10. What is the final length of a 1 m brass rod if it starts at 20°C and is heated to 100°C? The coefficient of linear expansion for brass is 19 x 10-6 (°C-¹).

2. Compare the heat loss from an insulated and an uninsulated copper pipe (k-400 W/m K) under the following conditions. The pipe has an internal diameter of 10 cm and an external diameter of 12 cm. The inside surface temperature of the pipe is at 110°C. The pipe is located in a space where all possible outside surface temperature of material was maintained at 30°C. The insulation available to reduce heat losses is 5 cm thick and its conductivity is 0.20 W/m K. If the furnace for heating the fluid in the pipe operating at an efficiency of 85% using natural gas priced at Cg = Php 1.00/MJ, what is the daily cost of heat loss per meter of pipe?