A Carnot refrigerator takes heat from water at 0°C and rejects heat to a room at 12°C. Suppose that 92.0 grams of water at 0°C are converted to ice at 0°C by the refrigerator
Calculate the mechanical energy that must be supplied to the refrigerator. The heat of fusion of water is 3.34 × 105 J/kg.
1350 J
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Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up.Linear momentum
a. is definitely conserved. b. is definitely not conserved. c. may or may not be conserved. d. none of the above
How did astronomers discover the relationship between spectral type and mass for main sequence stars?
A) by measuring the masses and spectral types of main-sequence stars in binary systems B) by using computer models of hydrogen fusion and stellar structure C) by measuring stellar radii with powerful telescopes D) by comparing stars with the same spectral type but different luminosities
Which of the following objects are probably not located in the same general region of the solar system in which they originally formed?
A) Kuiper belt comets B) asteroids of the asteroid belt C) Pluto D) Oort cloud comets
At which planet can the pole remain in darkness for 42 years, then have 42 years of constant daylight?
A) Pluto B) Neptune C) Uranus D) Jupiter E) Saturn