Question

Please help! Super simple math!
How do you find the mass of an object when given the volume only?

Answer 1

You need to know the density of the object. Mass = volume * density

Answer 2

If the object floats in water, then place it in a container that is calibrated for volume (like a graduated cylinder, assuming it will fit loosly and can move freely) which contains a known volume of water, sufficient to float the object. Measure the water level with the object floating in it and subtract the original volume of water in the cylinder. The volume of water your object has displaced (not the total volume of the object) is thus obtained. Multiply this volume by water's density (1.00 grams / ml. at 4 degrees C) to get the weight of water displaced, which is the weight of the object. For objects denser than water, you can use the same principle, just use a denser liquid, like mercury (nobody said it has to be totally safe for untrained children). In this method, you don't even need to know the volume, but if you have that information, you can also calculate the density of the object and use the density to calculate other volumes of the same material.

Answer 3

I have a rectangular prism that is drawn and it is labeled with l=10, h=2, and w=5.

Answer 4

The volume of the prism will be the area of it's base X the height of the prism. Since you have a rectangular prism, you can multiply the length by the width to get the area of its base. Now, multiply that by its height and you have the volume of the prism.

Answer 5

volume will be 100 unit^3

Answer 6

So what would be the formula?

Answer 7

lenght X height X weight

Answer 8

Ok, thanks sensuelle1985 and mathbrz.

Answer 9

I`ll give you medals. :)

Answer 10

anytime

Answer 11

sry let me open another question and just send a random reply and ill give u the medal.