The edge of a cube is measured with a Vernier: 10 VSD=9 MSD and 1 MSD=1 mm. Main-scale reading is 10 mm and the 1st Vernier division coincides. Cube mass is 2.736 g. If density is ρ g cm⁻³ to correct significant figures, find 100ρ.

Question

G1 Physics · Accepted Answer

Vernier LC=1−0.9=0.1 mm. Edge=10.0+1×0.1=10.1 mm=1.01 cm. Volume=(1.01)³≈1.0303 cm³. Density=2.736/1.0303≈2.655 g cm⁻³, which to the correct significant figures is 2.66. Thus 100ρ≈266. Answer: 266.