EXPERT ATTENTION REQUIRED ASAP
Q: The reading of a spring balance when a block is suspended from it in air is 60 N. The reading is changed to 40 N when the block is submerged in water. The relative density of the block is_______ .

RD =    W air / air - W water

RD = 60 / 60-40

RD = 60/ 20 = 3. 
              

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