A student measured the width of a solid tungsten cube using a digital vernier caliper.
The resolution of the caliper is 0.02 mm.
The student could have used a standard plastic school ruler to measure the width of the cube.
Explain how using a plastic ruler would have affected the accuracy of the student's measurement of width.
The mass of the tungsten cube was measured using an electronic top-pan balance.
The balance had a zero error.
Explain how the zero error may be corrected after readings had been taken from the balance.
The width of the cube was 18.20 mm. The density of the tungsten cube was 19.3 × 103 kg/m3.
Calculate the mass of the cube. Give your answer to 3 significant figures.