Finding the Mass of a Solid in 3d

In summary, the problem is asking for the mass of a solid bounded by a cylinder and a cone, with a given density function. The solution involves setting up a triple integral and solving for the mass. The individual steps and methods used may vary, but the final answer is confirmed to be 6\pi.
  • #1
c.dube
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Homework Statement


Find the mass of the solid bounded by the cylinder [itex]x^2+y^2=2x[/itex] and the cone [itex]z^2=x^2+y^2[/itex] if the density is [itex]\delta = \sqrt{x^2+y^2}[/itex]

[b2. The attempt at a solution[/b]
I had some trouble looking at how to set up the limits on this integral. What I came up with was:
[itex]2 \int_0^2 \int_0^{\sqrt{2x^2+2x}} \int_0^{\sqrt{x^2+y^2}} \sqrt{x^2+y^2} dzdydx [/itex]
[itex]= 2 \int_0^2 x^2\sqrt{x^2+y^2} + ((\sqrt{x^2+y^2})^3)/3 dx[/itex]
And this is just an ugly integral. I tried doing it in cylindrical coordinates but it wasn't working out terribly well that way either. Any hints? Thanks!
 
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  • #2
Nevermind, I got an answer. Can anyone confirm [itex]6\pi[/itex]?
 

Related to Finding the Mass of a Solid in 3d

What is the definition of mass?

Mass is a measure of the amount of matter in an object. It is often measured in kilograms (kg) or grams (g).

How do you find the mass of a solid in 3D?

To find the mass of a solid in 3D, you need to determine its volume and density. The formula for mass is: mass = volume x density. You can measure the volume of the solid by using a ruler, measuring the length, width, and height, and then using the formula for volume: volume = length x width x height. Density can be determined by dividing the mass of the solid by its volume.

What is the difference between mass and weight?

Mass and weight are often used interchangeably, but they are not the same. Mass is a measure of the amount of matter in an object, while weight is a measure of the force exerted on an object by gravity. Mass does not change, but weight can vary depending on the gravitational pull of the planet.

What tools can be used to measure mass?

There are several tools that can be used to measure mass, including a balance scale, a digital scale, and a triple beam balance. These tools use different methods to determine the mass of an object and are often used in scientific experiments and measurements.

Why is it important to find the mass of a solid in 3D?

Finding the mass of a solid in 3D is important in many scientific and real-world applications. It can help determine the amount of material needed for a construction project, the weight of an object for transportation purposes, and the density of a substance for chemical experiments. Mass is also a fundamental property of matter and is necessary for many calculations and equations in physics and chemistry.

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