Question

necklace of mass 57 gram is immersed in a Eureka can water from the Eureka can and flows into a ball whose mass increase from 35 to 50gram as water flows into it calculate the density of the necklace

Answer 1

Initial water mark on cylinder = 30ml
final water mark on cylinder = 38ml
volume of water displaced = 38 - 30 = 8ml

8ml = 8cm³
density of water = 1g/cm³
mass of water displaced = density*volume = 1 *8 = 8g = 0.008 kg

loss of weight = weight of water displaced = 0.008*9.8 N =0.0784 N
Loss of weight is same as the buoyant force.
So buoyant force is also 0.0784N