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 inches thick and meters in diameter. The density of platinum is 21,450 . What is the mass of the platinum disc in pounds ()?
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the volume of a cylinder (a disk is like a wide, short cylinder) is\[V=\pi r^2\ell\]where r is the radius
and mass is density times volume\[m=\rho V=\rho\pi r^2\ell\]
The Martian acceleration due to gravity is 3.61 while Earth's gravitational constant is 32.2 . What is the Earth weight of the disc in Newtons?
Weight is the force of gravity on an object.\[F_g=mg\]where g is the acceleration of gravity in that region.
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