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OpenStudy (anonymous):
A probe sent to the surface of Mars uncovers a pure platinum disc inscribed with the message, "We'll be right back" (in Martian, of course!). The disc is 3 inches thick and 0.9 meters in diameter. The density of platinum is 21,450 kg/m3
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OpenStudy (anonymous):
What is the mass of the platinum disc in pounds (lbm)?
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