A student is carrying out an experiment to determine the density of an obsidian glass sphere.
The student measures the volume of the sphere by displacement of water in a measuring cylinder. The results are shown in Table 1.
Table 1
| Volume of water (cm3\text{cm}^3cm3) | Volume of water and sphere (cm3\text{cm}^3cm3) | Volume of sphere YYY (cm3\text{cm}^3cm3) |
|---|---|---|
| 35.235.235.2 | 41.841.841.8 | YYY |
Calculate the volume of the sphere, YYY, in Table 1.
The student noticed that the digital balance had a zero error: it displayed a reading of −0.12 g-0.12\text{ g}−0.12 g before any object was placed on it.
How should the student correct this error after the mass of the sphere has been measured?
A different obsidian specimen has a volume of 1.85 cm31.85\text{ cm}^31.85 cm3. The density of this obsidian is 2.40 g/cm32.40\text{ g/cm}^32.40 g/cm3.
Calculate the mass of this different specimen in grams. State the formula you used to link density (ρ\rhoρ), mass (mmm), and volume (VVV).
Practise AQA GCSE Physics Changes of state and the particle model with exam-style questions for Foundation and Higher tier. 25 questions covering Density of materials and Changes of state, matched to the AQA GCSE Physics (8463) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.