Question

a metal object is suspended from a spring balance scale. the scale reads 800 N when it is suspended in air and 700 N when the object is completely submerged in water. find the buoyant force, the volume and the density of the metal.

Answer 1

bouyant force=100N

this force of 100N is equal to the weight of volume of the water displaced.

100N=densitywater*g*volumewater
solve for the volume of water displaced, that is equal to the volume of the metal submerged.

Now, that volume is submerged, so
density=mass/volume= (700/g)/Volume