Objects with like charges repel and unlike charges attract. A girls hair sticks to the comb because they both have-
A. Unlike charges
B. Like charges
C. No charge
D. Neutral charges

Why is metal often used for cooking pan?

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6–43 a food department is kept at 2128c by a refrigerator in an environment at 308c. the total heat gain to the food department is estimated to be 3300 kj/h and the heat rejection in the condenser is 4800 kj/h. determine the power input to the compressor, in kw and the cop of the refrigerator.