1. A 1m by 2m window of thickness 2mm between an insidetemperature of 20°C and a

Question

1. A 1m by 2m window of thickness 2mm between an insidetemperature of 20°C and an outside temperature of 0°Callows a loss of 120,000J each min. What is its thermalconductivity?    A) 0.1W/m°K    B)4W/°K    C)0.2Wm/°K    D) 6.0 J/m°Cs
   
2. A mole of the same gas is kept in each of 2 containers. Oneis kept under a 100N weight piston (at constant pressure) and theother in a closed container (constant volume). 200J of heat isadded to each. In the first, the temperature rises by10°C. By how much does the temperature rise in the secondcontainer?    A)10°C    B) 17°C    C)11.7°C    D) 7.1°C

3. Light falls at an incidence of 60° on a plastic of index ofrefraction equal to 2.0. What is the angle ofrefraction?    A)20°    B) 30°    C)23°    D) 26° 1. A 1m by 2m window of thickness 2mm between an insidetemperature of 20°C and an outside temperature of 0°Callows a loss of 120,000J each min. What is its thermalconductivity?    A) 0.1W/m°K    B)4W/°K    C)0.2Wm/°K    D) 6.0 J/m°Cs
   
2. A mole of the same gas is kept in each of 2 containers. Oneis kept under a 100N weight piston (at constant pressure) and theother in a closed container (constant volume). 200J of heat isadded to each. In the first, the temperature rises by10°C. By how much does the temperature rise in the secondcontainer?    A)10°C    B) 17°C    C)11.7°C    D) 7.1°C

3. Light falls at an incidence of 60° on a plastic of index ofrefraction equal to 2.0. What is the angle ofrefraction?    A)20°    B) 30°    C)23°    D) 26°

Explanation / Answer

1. k = p L / A[T' - T]         = [120000 / 60 ] * 2 x10-3 / 2 * 1 * 20         = 0.1 J / smoC         = 0.1 W / m oK 3. 1 * sin60 = 2 * sin      ==> sin = sin60 / 2 =0.4333      ==> = 25.65 ˜26o

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