## anonymous 4 years ago 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 ()?

1. TuringTest

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

2. anonymous

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?

3. TuringTest

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

4. anonymous

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?