Why don't we use "efficiency" for rating refrigerators, like we rate engines, instead of the Coefficient of Performance?

What will be an ideal response?


In both cases we desire a ratio of "what we want" divided by "what it costs"; for a refrigerator this is "heat absorbed"/"work input" (COP) but for an engine this is "work out"/"heat in" (= eff).

Physics & Space Science

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Astronomers can measure a star's mass in only certain cases. Which one of the following cases might allow astronomers to measure a star's mass?

A) The star is a member of a binary star system. B) The star is of spectral type G. C) The star is of spectral type A. D) We know the star's luminosity and distance.

Physics & Space Science

Which of the following is a contribution that Kepler made to astronomy?

A. He discovered his Three laws (of Planetary Motion). B. He discovered four moons (or satellites) of Jupiter. C. He discovered epicycles. D. He determined the size of Earth.

Physics & Space Science

Atomic nuclei consist of protons and electrons

Indicate whether the statement is true or false

Physics & Space Science

Contrast the Oort cloud and the Kuiper belt as possible origins for comets

What will be an ideal response?

Physics & Space Science