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calculating the density of a sphere

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  • calculating the density of a sphere

    If someone can explain this to me I would greatly appreciate it.
    volume=4/3pi r3

    my diameter is 4.2



    thank you in advance

  • #2
    Re: calculating the density of a sphere

    We actually have a calculator up for that here:
    http://www.onlineconversion.com/obje...ume_sphere.htm

    volume = 4/3 * Pi * (radius * radius * radius)

    The radius is 1/2 the diameter. Your diameter is 4.2 then the radius is 2.1.

    If your measurement is in inches, the volume will be cubic inches. If your measurement is meters, the volume cubic meters. etc.

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    • #3
      Re: calculating the density of a sphere

      I have a small question...
      I am a senior in high school, and I am having a problem comprehending the formula for calculating the density of a solid sphere. I was wondering if anyone would be able to help me out.

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      • #4
        Re: calculating the density of a sphere

        For any shape, density = mass/volume.

        So you need to measure the sphere's mass on a scale, then measure it's diameter, divide by 2 to get radius, and compute volume per the formula given above.

        What problem are you having? Can you be more specific?

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        • #5
          Re: calculating the density of a sphere

          I actually had a question....
          how would u solve a problem if the mass of a plastic ball was given with its density. How can u calculate the volume?
          Any help is appreciated. Thank u.

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          • #6
            Re: calculating the density of a sphere

            Originally posted by Gagan View Post
            I actually had a question....
            how would u solve a problem if the mass of a plastic ball was given with its density. How can u calculate the volume?
            Any help is appreciated. Thank u.
            Divide the mass by the density

            (make sure the mass is measured using the same mass units as are in the numerator of density.)

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            • #7
              using Stokes method.

              I know how to use the equation for finding the density of a sphere.my proble is that my diameter is 0.5mm.so shud I convert to SI units or leave it in mm?because after that I have to work out viscocity.thank you

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              • #8
                Re: using Stokes method.

                Originally posted by Unregistered View Post
                I know how to use the equation for finding the density of a sphere.my proble is that my diameter is 0.5mm.so shud I convert to SI units or leave it in mm?because after that I have to work out viscocity.thank you
                Do you know what units are expected for the density? (in the viscosity formula) You can work it out in any units and convert afterward, but it is easier to convert first to the mass units you want in the numerator and the length units you want (cubed) in the denominator.

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                • #9
                  Re: calculating the density of a sphere

                  what is the mass of a metal ball in kg whose density is 8.96g and diameter is 12.0cm?

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                  • #10
                    Re: calculating the density of a sphere

                    this is fairly simple to do
                    say you where calculating the density of the earth first you would have to find the volume of the earth which is 26682593.6
                    then the formula for denstity which is density=mass ×volume
                    mass = 5.97×10 to the power of 24
                    ta -da!!!!!!!!!

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                    • #11
                      Re: calculating the density of a sphere

                      Originally posted by Ginger13 View Post
                      this is fairly simple to do
                      say you where calculating the density of the earth first you would have to find the volume of the earth which is 26682593.6
                      then the formula for denstity which is density=mass ×volume
                      mass = 5.97×10 to the power of 24
                      ta -da!!!!!!!!!
                      Actually, density is mass divided by volume

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                      • #12
                        Re: calculating the density of a sphere

                        i was sitting in the iss room and could not figure out how to get the density and neither could he so everyone who explained it thank you you guys were a big help

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                        • #13
                          Re: calculating the density of a sphere

                          If a ball had a radius of 10cm and contained 5g of air, how would you calculate the density of the ball?

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                          • #14
                            Re: calculating the density of a sphere

                            Originally posted by Unregistered View Post
                            If a ball had a radius of 10cm and contained 5g of air, how would you calculate the density of the ball?
                            You can calculate the volume of the ball using the formula:
                            volume = 4/3 * Pi * radius3

                            Then density will be:
                            mass / volume

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                            • #15
                              cylindrical vessel of 12 cm dia contains some water.if a spherical
                              ball of 6 cm dia is completely submerged in the water.find the risein
                              the levelof water in the vessel.

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