- Question 5 A A Copper Pipe Has A Length 254 M At 12 Noon Midday Where It Reaches A Temperature Of 78 C During The N 1 (84.49 KiB) Viewed 15 times
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Question 5 (a) A copper pipe has a length 254 m at 12 noon (midday) where it reaches a temperature of 78°C. During the night it then contracts by 341 mm. If the coefficient of linear expansion for copper is 19.3 x 10-6/°C, calculate the temperature of the copper pipe during the night. (4 Marks) (b) 10 kilograms of water at a temperature of 20°C is mixed with 500 g of water at 94°C. Calculate final temperature of water. (6 Marks) (c) 3 kg of oil with a heat value of 55 MJ/kg are used to heat up water from 20°C to 90°C. If the efficiency of the system is 83%, calculate the quantity of water if the specific heat capacity of water is 4187 J/kg°C. (5 Marks) (d) A 5 cm thick square copper bar 1 m long is used to transport 250kJ of heat along its length. If the process takes 1 minute, and one end is fixed at 20°C, which will be the temperature of the other end? If λ for copper is taken as 385 W/m.°C (5 Marks) (e) A large circular pot is used to boil water. It is then left to cool unheated in a room at a temperature of 20°C and it loses 7389 J in 6 minutes. Assume the heat transfer coefficient by free convection is 10 W/m2 K for. Calculate the width of the pot opening. (Tip: what is the temperature of boiling for water?) (6 Marks) (f) Describe the 3 states of matter in your own words. (2 Marks)