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 ()?

Question

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 ()?

turingtest · Answer

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$$m=\rho V=\rho\pi r^2\ell$$

anonymous · Answer

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?

turingtest · Answer

Weight is the force of gravity on an object.$$F_g=mg$$where g is the acceleration of gravity in that region.

anonymous · Answer

If gas costs $ per gallon at a local service station and 1 gallon= 231 cubic inches.how many cubic feet of gas can a customer buy with $ ? I got that as 2529.45 ft^3. how far can the customer drive if the car gets miles per cubic foot of gas?