The water level in a metric measuring cup is 0.75 L before the addition of a pebble weighing 150 g. The water level after submerging the pebble is 0.82 L. Determine the density of the pebble.

The volume displaced by the pebble = 0.82- 0.75 = 0.07 L = 70 mL

Mass of the pebble = 150 g

Therefore, density of the pebble is

Density = Mass / Volume

= 150/70 = 2.14 g ${{ml}^{-1}}$