Shown following are three terrestrial planets of our solar system. Rank the planets based on the amount of time the surface of the planet has had a moderate to high level of volcanic/tectonic activity, from longest to shortest.
Answer: The picture above is a good example
Earth, Mars, Mercury
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A 30 feet high vertical wall is separated from a glass wall parallel to it, as shown. When the wall surface temperature is 85ºF and the glass temperature is 25ºF, estimate the heat transfer between the two surfaces.
What was most surprising about SN1987A?
A) Its pulsar appeared within weeks of the explosion. B) The supernova was luminous enough to see with the naked eye. C) The supernova was not even in our own Galaxy. D) The parent star was a blue supergiant, much like Deneb or Rigel. E) It did not produce the flood of neutrinos our models had led us to expect.
If the efficiency of a reversible engine is 28%, what is its COP (performance coefficient) operated (a) as a refrigerator, and (b) as a heat pump?
What will be an ideal response?
What effect would stirring the mixture have on the rate of dissolving the solid in a liquid?