Explain how the specific heats of materials are measured using the technique of calorimetry
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The specific heat of a substance can be determined by measuring the masses and temperature changes of the objects involved. Typically a substance of known mass and temperature is put into a quantity of water in a calorimeter. The water is at a different temperature from that of the substance, usually a lower one. The principle of the conservation of energy is then applied to determine the substance's specific heat. This method is called the method of mixtures.
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Velma, the space woman, is orbiting above Earth's surface in a low-altitude orbit. Does she actually have weight, or is she actually weightless, and why?
A) She actually has weight, because Earth actually is pulling on her with nearly the normal pull of gravity. B) She is weightless because she is away from the pull of Earth's gravity. C) She is weightless because she is falling freely around the earth. D) She is weightless because she is in a vacuum. E) She actually has weight, because her weight remains the same no matter where she goes in the universe.
Short-period comets, such as Halley's comet, are believed to come from ______________
a. the Kuiper Belt b. the Oort cloud c. the asteroid belt d. Earth
An important radiometric dating process is the decay of potassium-40 to ______________-40
Fill in the blank(s) with correct word
Why is there an upper end in the main sequence of the H-R diagram?
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