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A metal rope of density $6000 k g m^{- 3}$ has breaking stress $9.8 \times 10^{8} N m^{- 2}$ . This rope is used to measure the depth of the sea. Then the depth of the sea that can be measured without breaking is

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a

10×103m

b

20×103m

c

30×103m

d

40×103m

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detailed solution

Correct option is B

l=B. stressd-dwg =9.8×1086000-1000×9.8=20×103m

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