(Solved):   please help me out Question 2 (33) 2.1. A Camot refrigerator transfers heat from its insi ...

 

please help me out

Question 2 (33) 2.1. A Camot refrigerator transfers heat from its inside 6.0°C to the room air outside 20.0°C (a) Find the coefficient of performance of the refrigerator. (3) (b) Determine the magnitude of the minimum work needed to cool 5.00 kg of water from 20.0°C to 6.0°C when it is placed in the refrigerator. 2.2. An ideal monatomic gas expands isobarically from state A to state B. It is then compressed isothermally from state B to state C and finally cooled at constant volume until it returns to its initial state A. VA=4x 10³ m³ PB 1 106 Pa V=8x 10³ m³ TA 600 K PA Pe 2x 106 Pa B (i). What is the temperature of the gas when it is in state B? (3) (ii). How much work is done on the gas in going from B to C? (3) (iii). How much work is done by the gas in expanding isobarically from A to B? (3) 3 2.3. A Carnot heat pump operates between an outdoor temperature of 265 K and an indoor temperature of 298 K. Calculate its coefficient of performance. (4) 2.4. Show that the maximum possible efficiency of an engine operating between the boiling and freezing points of water at sea level is 0.27. (5) 2.5. Due to a tune-up, the efficiency of an automobile engine increases by 5.0%. For an input heat of 1300 J, how much more work does the engine produce after the tune-up than before? (3) 2.6. A Carnot engine operates with an efficiency of 27.0% when the temperature of its cold reservoir is 275 K. Assuming that the temperature of the hot reservoir remains the same. Calculate the temperature of the cold reservoir in order to increase the efficiency to 32.0%. (5)