A measurement that both size and direction may be represented by an arrow

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

What is meant by the statement" the melting poin of glycerine is 13 degree celsius

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.