1 liter= 10-3 m' Cair-1.003 KJ/kg K g Clead=0.128 KJ/kg K Cwater =4.18 kJ/kg K Attempt all questions. 1-The time needed to raise the temperature of 320 gm of water by 90°C using a heater of 200 W, in seconds is A] B] C] D] E] 1.2 0.9 0.6 3.2 0.1 2- A 1500-kg car travels at 30 m/s. The driver brakes to stop the car and all the kinetic energy is converted to heat in the four drums brake each of 8-kg. The rise in the temperature in the brake drums is (The specific heat of the brake drum is 448 J/kg °C) A] B] C] D] E] 60.6 47.1 95.2 55.9 none 3-A 200.0 gm sample of a material at 80.0°C is mixed with 100.0 gm of water at 20.0°C. at the thermal equilibrium temperature 24.0°C. the specific heat of the material in KJ/KG°C is. A] B] C] D] E] 0.15 0.61 0.97 1.6 none 4]1000 mol of perfect gas is heated under constant volume by 249.42 KJ so that its temperature is raised from 5 °C to 15 °C. The number of the degrees of freedom is A] B] C] D] E]

1 liter= 10-3 m' Cair-1.003 KJ/kg K g Clead=0.128 KJ/kg K Cwater =4.18 kJ/kg K Attempt all questions. 1-The time needed to raise the temperature of 320 gm of water by 90°C using a heater of 200 W, in seconds is A] B] C] D] E] 1.2 0.9 0.6 3.2 0.1 2- A 1500-kg car travels at 30 m/s. The driver brakes to stop the car and all the kinetic energy is converted to heat in the four drums brake each of 8-kg. The rise in the temperature in the brake drums is (The specific heat of the brake drum is 448 J/kg °C) A] B] C] D] E] 60.6 47.1 95.2 55.9 none 3-A 200.0 gm sample of a material at 80.0°C is mixed with 100.0 gm of water at 20.0°C. at the thermal equilibrium temperature 24.0°C. the specific heat of the material in KJ/KG°C is. A] B] C] D] E] 0.15 0.61 0.97 1.6 none 4]1000 mol of perfect gas is heated under constant volume by 249.42 KJ so that its temperature is raised from 5 °C to 15 °C. The number of the degrees of freedom is A] B] C] D] E]