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3 years ago

5

What are the purpose of studying the strength of materials and testing.

1 answer:

Gnoma [55]3 years ago

8 0

Answer:

Materials testing is often the last step in the "manufacturing process". The end result comes down to the quality of the materials and final product. If the material that goes into the product is defective, then the product may be defective. Quality cannot be put in after the fact. In forming materials, understanding the material’s properties can help to better predict the manufacturing outcome. (:

Explanation:

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Determine the COP of a refrigerator that removes heat from the food compartment at a rate of 5160 kJ/h for each kW of power it c

Mars2501 [29]

Answer:

$COP_R=1.433\\Q_H=2.433kW$

Explanation:

Hello,

In this case, the coefficient of performance of this refrigerator is defined in terms of the removed heat and the work input as:

$COP_R=\frac{Q_{L}}{W_{in}} =\frac{5160\frac{kJ}{h}*\frac{1h}{3600s} }{1kJ/s} =1.433$

Moreover, the rate of heat rejection to the outside air tuns out:

$W_{in}=Q_H-Q_L\\Q_H=W_{in}+Q_L=1kW+5160\frac{kJ}{h}*\frac{1h}{3600s} =2.433kW$

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