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vfiekz [6]
3 years ago
13

Mass = 10Kg velocity = 5m/s what is the kinetic energy = ? Joules

Physics
2 answers:
nirvana33 [79]3 years ago
5 0

Answer:

Hello There!!

Explanation:

You use the formula:K.E. = 1/2 m v2.

kinetic energy=1 / 2 × 10 × 5 ²(the power of 2 means you multiply the number by itself)

half of 10 is 5 so you do 5×5².

kinetic energy=5×5²=(5×5=25) so 25×5=125 Joules.

hope this helps,have a great day!!

~Pinky~

alexdok [17]3 years ago
3 0

Answer:

kinetic energy = 1 / 2 mv²

kinetic energy = 1 / 2 × 10 × 5 ²

kinetic energy = 5 × 25

kinetic energy = 125 joules

..........

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What would be the coefficient of performance if the refrigerator (operating between the same temperatures) was instead used as a
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Complete Question

A certain refrigerator, operating between temperatures of -8.00°C and +23.2°C, can be approximated as a Carnot refrigerator.

What is the refrigerator's coefficient of performance? COP

(b) What If? What would be the coefficient of performance if the refrigerator (operating between the same temperatures) was instead used as a heat pump? COP

Answer:

a

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b

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Explanation:

From the question we are told that

     The lower operation temperature of refrigerator is  T_1 =  -8.00^oC =  265 \  K

     The upper operation temperature of the refrigerator is   T_2 =  23.2 ^oC =  296.2 \  K

Generally the refrigerators coefficient of performance is mathematically represented as

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=>     COP =  \frac{265}{296.2 - 265  }

=>     COP = 8.49

Generally if a refrigerator (operating between the same temperatures) was instead used as a heat pump , the coefficient of performance is mathematically represented as

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=>         COP_1 =  \frac{296.2}{ 296.2 - 265 }  

=>         COP_1 = 9.49  

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