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Math Help - Mass and Dimensions

  1. #1
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    Mass and Dimensions

    Hello All...

    This is my first posting so I am not sure if this is the right section.

    I am having a hard time figuring out how to do this problem:

    Question: Determine the mass of a tombstone made of the same material as the granite rock and having the dimensions of 260 cm by 90 by 40 cm. What is the mass of the tombstone?

    ..

    I have not been given the mass of the granite rock yet, but once I do how would I set up this problem?
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  2. #2
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    Re: Mass and Dimensions

    Quote Originally Posted by dempsey1905 View Post
    Hello All...

    This is my first posting so I am not sure if this is the right section.

    I am having a hard time figuring out how to do this problem:

    Question: Determine the mass of a tombstone made of the same material as the granite rock and having the dimensions of 260 cm by 90 by 40 cm. What is the mass of the tombstone?

    ..

    I have not been given the mass of the granite rock yet, but once I do how would I set up this problem?
    1. Use the definition of density of a material:

    density = \frac{mass}{volume} ....... Then mass = density \cdot volume

    2. Have a look here: Granite - Wikipedia, the free encyclopedia

    In this text about the various forms of granite you'll find: "The average density of granite is between 2.65 and 2.75 g/cm3, ...."

    If I were you I would take d_{granite} = 2.7\ \tfrac{g}{cm^3}

    3. Since you now know the mass of 1 cm³ of granite you only have to determine the volume of the tombstone. Go ahead!
    Thanks from dempsey1905
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  3. #3
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    Re: Mass and Dimensions

    Thank you!
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