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Q.

The relative density of a metal may be found by hanging a block of metal from a  spring balance and noting that in air the balance reads (5.00±0.05)N while in water it reads (4.00±0.05)N .  The relative density would be quoted as

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a

5.00±11%

b

5.00±10%

c

5.00±6%

d

5.00±5%

answer is A.

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Detailed Solution

d=W1W1−W2=55-4=5 W1−W2=(1.00±0.10)NΔdd×100=0.055.00+0.101.00×100=11%
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The relative density of a metal may be found by hanging a block of metal from a  spring balance and noting that in air the balance reads (5.00±0.05)N while in water it reads (4.00±0.05)N .  The relative density would be quoted as