A bucket of water is suspended from a spring balance. What happens to reading of balance
(a) when a piece of stone suspended from a string is immersed in the water without touching the bucket
(b) when a piece of lead or cork is put in the water in the bucket.

Explanation

(a) Increase in reading will be equal to upthrust
`F_B = rho_omega Vg = rho_omega (m)/(sigma) g = (rho_omega)/(sigma)mg(lt mg), as sigma lt rho_omega`
New reading `= W_0 + F_B`
(b) Now increase in reading will be equal to weight lead/cork
New reading `= W_0 + omega`,
`omega` , weight of lead/cork.
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