Ahousehold refrigerator runs one-fourth of the time and removes heat from the food compartment at an average rate of 800 kj/h. if the cop of the refrigerator is 2.2, determine the power the refrigerator draws when running.

1454.54 kJ/h or 0.404 kW

Explanation:

Given:

Removal of heat by the refrigerator = 800 kJ/h

Coefficient of performance, COP of the refrigerator = 2.2

given that the  refrigerator runs one-fourth of the time only

therefore, refrigerator removes the heat, Q = = 3200 kJ/h

Now, the Power drawn by the refrigerator while running =

=  

= 1454.54 kJ/h

Hence, the power drawn by the refrigerator while running is = 1454.54 kJ/h

or 0.404 kW      (as 1 kW = 3600 kJ/h)

28. evolution

29. environment, survive, offspring  

explanation:

force tends to be low and long diustance masses are high