physics - density Flashcards
1
Q
how to measure the density of a regularly shaped object?
A
- measure the dimensions of the shape, calculate volume
- measure the mass using a calibrated balance
- calculate density from the mass and volume
2
Q
What is the equation linking mass, density and volume?
A
density = mass / volume
3
Q
what units are used for density?
A
kg/m^3
4
Q
how to convert from g/cm^3 to kg/m^3?
A
multiply the value by 1000
5
Q
how to calculate density of an irregularly shaped object?
A
- measure the mass of the object
- fill a displacement can with water and submerge the object
- record the volume of water that has been displaced
- calculate density from the mass and volume
6
Q
what should you place under the spout of the can to collect all the water?
A
a measuring beaker
7
Q
how to fill the displacement can to get the most accurate results?
A
- fill the can until the water starts to drip out the spout and into the beaker. Wait until the dripping just stops before submerging the object
8
Q
how to calculate the density of a liquid?
A
- measure the mass of an empty measuring cylinder
- pour 100cm^3 of the liquid into the cylinder and record the volume
- measure the mass of the cylinder with the liquid in, and subtract the empty mass to find the mass of liquid
- calculate density from mass and volume
9
Q
how does the density of solids and liquids compare?
A
in general, solids are more dense than liquids since their particles are packed together more tightly than in a liquid, so more mass per unit volume
