How do you calculate/find mass, volume?

[brysonlee]

I did my homework and there are some bonus questions that we really never learned about in class, if we get them right it adds to the mark, it says find mass and volume and things, any help?

 

[iRaid]

density = mass/volume

 

[brysonlee]

The question is, A material has a density of 50kg/m cubed, and sides that measure 2m, 2m, and 5m, find the mass

other is

A material has a density of 6 kg/m cubed, and a mass of 22kg, find the volume,

For the second question would you multiple density and mass, or divide?

 

[gneill]

The question is, A material has a density of 50kg/m cubed, and sides that measure 2m, 2m, and 5m, find the mass

other is

A material has a density of 6 kg/m cubed, and a mass of 22kg, find the volume,

For the second question would you multiple density and mass, or divide?

Forget the numbers for a moment and just look at the units of each quantity. If you perform the operations that you indicate (multiplying density and mass, dividing density by mass), what are the units of the results?

 

[symbolipoint]

iRaid gave the basic information, and there is enough information in your problem descriptions to find the basic parts that you need to work with.

Your first question shows enough information to calculate the volume, so you have enough to find mass. The second question gives mass but asks for volume. Either case, you use the same basic relationship:

Letting m = mass, v = volume, d = density, you rely on any equivalent equation for
d = \frac{m}{v}