Question

an object weigh 75 gram in air and 55.6 gram in water find the relative density of solid will it sink or float in water

Answer 1

Hey,

Relative density of an object = density of object/density of water 
but r .d of object =75-55.6
=19.4

density of object/density of water =75/19.4
= 3.86

HOPE IT HELPS YOU:-))

Answer 2

weight in air=76 gm
weight in water=55.6 gm
upthrust= weight in air- weight in the water
upthrust=20.4
relative density=up thrust/weight in the air
=20.4/76
=0.268