Take the 2-minute tour ×
Mathematics Stack Exchange is a question and answer site for people studying math at any level and professionals in related fields. It's 100% free, no registration required.

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 4 inches thick and 0.9 meters in diameter. The density of platinum is 21,450 kg/m3. What is the mass of the platinum disc in pounds (lbm)? The Martian acceleration due to gravity is 3.61 m/s2 while Earth's gravitational constant is 32.2 ft/s2. What is the Earth weight of the disc in Newtons?

share|improve this question

closed as off topic by sdcvvc, Asaf Karagila, Alexander Gruber, 5PM, Paul Feb 9 '13 at 2:55

Questions on Mathematics Stack Exchange are expected to relate to math within the scope defined by the community. Consider editing the question or leaving comments for improvement if you believe the question can be reworded to fit within the scope. Read more about reopening questions here.If this question can be reworded to fit the rules in the help center, please edit the question.

    
What have you tried? –  anorton Feb 9 '13 at 0:42
    
I had no Idea about this question –  Sami Alshehry Feb 9 '13 at 0:42
2  
Is it mass question or math question? –  Asaf Karagila Feb 9 '13 at 0:42
2  
I guess this is homework? (looking at your other question) Don't really know where to start "no idea" is not very precise. What do you know, what is your problem? Just getting the answer on here will not help you. –  example Feb 9 '13 at 0:44
2  
SHOUTING is considered rude. And simply pasting a question without adding your own thoughts isn't the best way towards an answer either. –  MvG Feb 9 '13 at 0:47

1 Answer 1

$$ \mbox{density} = \frac{\mbox{mass}}{\mbox{volume}} $$ so to find the mass, find the density and volume and solve appropriately.

$$ \mbox{force} = \mbox{mass}\times\mbox{acceleration}. $$ Weight is force exerted by gravity. To find weight, find mass and acceleration due to gravity and solve appropriately.

(Of course, in all this, make sure your units match up.)

share|improve this answer
1  
Thanks very much.. –  Sami Alshehry Feb 9 '13 at 0:44

Not the answer you're looking for? Browse other questions tagged or ask your own question.