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Can anyone explain how to solve these problems?

Can Anyone Explain How To Solve These Problems class=

Sagot :

onyebuchinnaji

The refrigerator's coefficient of performance is 3.81.

The refrigerator's power input is 504 W.

Refrigerators coefficient of performance

The refrigerators coefficient of performance is calculated as follows;

[tex]COP = \frac{T_{cold}}{T_{hot} - T_{cold}}[/tex]

  • The cold temperature = -71⁰C = 202 K
  • The hot temperature = -18⁰C = 255 K

[tex]COP = \frac{202}{255 - 202} \\\\COP = 3.81[/tex]

Work done in the refrigerator

[tex]W = P \Delta V = P (V_2 - V_1)\\\\W = 150 \times 10^3 (100 \times 10^{-6} \ - \ 40 \times 10^{-6})\\\\W = 9 \ J[/tex]

Refrigerators power input

[tex]P = \frac{E}{t} \\\\P = 9 \ J \ \ \times \ \ 56 \ \frac{cycle}{s} \\\\P = 504 \ J/s \ = \ 504 \ W[/tex]

Learn more about coefficient of performance here: https://brainly.com/question/16188638

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