A spring balance reads 120 N for a block in air and 80 N when fully submerged in water. Find its specific gravity.
Physics · Mixed Chapter
JEE Main Practice

Question

A spring balance reads 120 N for a block in air and 80 N when fully submerged in water. Find its specific gravity.

G1 Physics · Accepted Answer

Step 1: Weight in air W=120 N. Step 2: Buoyant force on full submersion B=120−80=40 N. Step 3: Specific gravity =ρ_block/ρ_water=W/B=120/40=3.