Question

The mass of a solid iron cube of side 3 cm is to be determined by using a spring balance if the density of iron is about 8.5 g CC-1, what should be the least count of the best cuatile spring balance to determine the weight of solid

Answer 1

mass  = m
cube edge = 3 cm
volume of the cube = 3 * 3 * 3 = 27 cm³
density of iron = 8.5 gms/cc
mass of cube = m = volume * density = 229.5 gms

since the mass is 229.5 grams. we should be able to measure upto 0.1 gram accurately.

so the least count should be 0.1 gm.