A refrigerator works between 4^@C and 30^@C. It is required to remove 600 calories of heat every second in order to keep the temperature of the refrigerated space constant. The power required is _____ (1 cal = 4.2 Joules)

A refrigerator works between 4^@C and 30^@C. It is required to remove

1.	A refrigerator works between 4^@C and 30^@C. It is required to remove 600 calories of heat every second in order to keep the temperature of the refrigerated space constant. The power required is _____ (1 cal = 4.2 Joules)
Answer» 23.65 W 236.5 W 2365 W 2.365 W Solution :`T_1`=4+273=277 K `T_2`=30+273=303 K `Q_1`=-600 CAL `rArr` For REFRIGERATOR `Q_1/Q_2=T_1/T_2` `therefore (Q_2+W)/Q_2=T_1/T_2 [ because Q_1=Q_2+W]` `therefore 1+W/Q_2=277/303` `therefore W=(277/303-1)Q_2` `=-26/303xx(-600xx4.2)` `=(26xx600xx4.2)/303` =216.2 W `APPROX` 236.5 W, closest value.