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CHAPTER-18 3T071,T062, T061Z3T071H3lT071: Q9. A glass flask with volume 250 cm3 is filled with mercury at 25 oC. How much mercury overflows when the temperature of the system is raised to 105 oC (the coefficient of linear expansion of glass is 4.0 10-6 K-1 and coefficient of volume expansion of mercury is 1.82 10-4 K-1). (Ans: 3.4 cm3)
Q10. How much ice at -10.0 oC must be added to 4.0 kg of water at 20.0 oC to cause the resulting mixture to be liquid water at 0 oC ? ( cice = 2220 J/kg.K) (Ans: 0.94 kg)
Q11. One end of a steel bar is welded to one end of a copper bar. Both bars have the same length and cross sectional area. The free end of the steel bar is maintained at 100 oC and free end of the copper bar is maintained at 0.0 oC. Find the temperature of the junction at steady state.(k steel = 50.2 W/m.K; kcopper = 385 W/m.K) (Ans: 11.5 ),7q3P33A(R(78333(+(:(3(6(P333(JQ'*9
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T062:03.T062:Q10. A metal rod has a length of 7.30 m at 15 C and a length of 7.40 m at 95 C. What is the temperature of the rod when its length is 7.21 m? (Ans: -57 C)
Q11. 100 g of ice at 0 C is mixed with 100 g of water at 70 C, what is the final temperature of the mixture? (0 C)
Q12. The Figure above shows five slabs of different materials with equal thickness and same cross sectional area, placed side by side. Heat flows from left to right and steady state temperatures are given at the interfaces. Which slab has largest thermal conductivity? (Ans: 3)
Q13. A temperature difference of 25 K is equal to: (Ans: a difference of 45 on the Fahrenheit Scale.)q3P/ K%4>:/!T061B3T061:Q9. A steel rod is 4.000 cm in diameter at 35 0C. A brass ring has an inner diameter of 3.992 cm at 35 0C. At what common temperature will the brass ring slide onto steal rod? asteel= 11x 10-6/ K ; abrass= 19 x 10 - 6 / K ( Ans 286 0C )
Q10. What mass of steam initially at 100 0C should be mixed with 160 g of ice at 0 0C in a thermally insulated container to produce liquid water at 40 0C. (Ans: 32 g )
Q11. A 20-kg block of copper is dropped and falls 122 m. Calculate the raise in the temperature of the block if all the potential energy lost in the fall is converted to heat. [The specific heat of copper = 386 J/kg.K] (Ans: 3.1 K)
Q12. The following figure shows a steel bar 15 cm long welded end to end to a copper bar 30 cm long. Each bar has a square cross section of 2.2 cm2 on a side. The free end of steel is maintained at 100 0C and the free end of copper is maintained at 0.0 0C. Find the temperature at the junction of the two bars? Ksteel= 50.2 W/m.K; Kcopper =385 W/m.K] (Ans: 21 C)Dq3P.(9(H
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/00DArialngs MS0TT\wܖ0ܖDComic Sans MS0TT\wܖ0ܖB DSymbolans M@`q\5@Y:/!T0613T061:Q9. A steel rod is 4.000 cm in diameter at 35 0C. A brass ring has an inner diameter of 3.992 cm at 35 0C. At what common temperature will the brass ring slide onto steal rod? asteel= 11x 10-6/ K ; abrass= 19 x 10 - 6 / K ( Ans 286 0C )
Q10. What mass of steam initially at 100 0C should be mixed with 160 g of ice at 0 0C in a thermally insulated container to produce liquid water at 40 0C. (Ans: 32 g )
Q11. A 20-kg block of copper is dropped and falls 122 m. Calculate the raise in the temperature of the block if all the potential energy lost in the fall is converted to heat. [The specific heat of copper = 386 J/kg.K] (Ans: 3.1 K)
Q12. The following figure shows a steel bar 15 cm long welded end to end to a copper bar 30 cm long. Each bar has a square cross section of 2.2 cm2 on a side. The free end of steel is maintained at 100 0C and the free end of copper is maintained at 0.0 0C. Find the temperature at the junction of the two bars? Ksteel= 50.2 W/m.K; Kcopper =385 W/m.K] (Ans: 21 C)Dq3P.(9(H
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CHAPTER-18 3T071,T062, T061Z3T071H3lT071: Q9. A glass flask with volume 250 cm3 is filled with mercury at 25 oC. How much mercury overflows when the temperature of the system is raised to 105 oC (the coefficient of linear expansion of glass is 4.0 10-6 K-1 and coefficient of volume expansion of mercury is 1.82 10-4 K-1). (Ans: 3.4 cm3)
Q10. How much ice at -10.0 oC must be added to 4.0 kg of water at 20.0 oC to cause the resulting mixture to be liquid water at 0 oC ? ( cice = 2220 J/kg.K) (Ans: 0.94 kg)
Q11. One end of a steel bar is welded to one end of a copper bar. Both bars have the same length and cross sectional area. The free end of the steel bar is maintained at 100 oC and free end of the copper bar is maintained at 0.0 oC. Find the temperature of the junction at steady state.(k steel = 50.2 W/m.K; kcopper = 385 W/m.K) (Ans: 11.5 ),7q3P33A(R(78333(+(:(3(6(P333(JQ'*9
51
T062:03.T062:Q10. A metal rod has a length of 7.30 m at 15 C and a length of 7.40 m at 95 C. What is the temperature of the rod when its length is 7.21 m? (Ans: -57 C)
Q11. 100 g of ice at 0 C is mixed with 100 g of water at 70 C, what is the final temperature of the mixture? (0 C)
Q12. The Figure above shows five slabs of different materials with equal thickness and same cross sectional area, placed side by side. Heat flows from left to right and steady state temperatures are given at the interfaces. Which slab has largest thermal conductivity? (Ans: 3)
Q13. A temperature difference of 25 K is equal to: (Ans: a difference of 45 on the Fahrenheit Scale.)q3P/ K%4>:/!T0613T061:Q9. A steel rod is 4.000 cm in diameter at 35 0C. A brass ring has an inner diameter of 3.992 cm at 35 0C. At what common temperature will the brass ring slide onto steal rod? asteel= 11x 10-6/ K ; abrass= 19 x 10 - 6 / K ( Ans 286 0C )
Q10. What mass of steam initially at 100 0C should be mixed with 160 g of ice at 0 0C in a thermally insulated container to produce liquid water at 40 0C. (Ans: 32 g )
Q11. A 20-kg block of copper is dropped and falls 122 m. Calculate the raise in the temperature of the block if all the potential energy lost in the fall is converted to heat. [The specific heat of copper = 386 J/kg.K] (Ans: 3.1 K)
Q12. The following figure shows a steel bar 15 cm long welded end to end to a copper bar 30 cm long. Each bar has a square cross section of 2.2 cm2 on a side. The free end of steel is maintained at 100 0C and the free end of copper is maintained at 0.0 0C. Find the temperature at the junction of the two bars? Ksteel= 50.2 W/m.K; Kcopper =385 W/m.K] (Ans: 21 C)Dq3P.(9(H
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