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Q.

The length of a rubber cord floating on water is 5 cm. The force needed to pull the cord out of water is ..... N (surface tension of water is7.2 x 10-4 Nm-1) .

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a

7.2 x 10-3

b

7.2 x 10-4

c

7.2 x 10-5

d

7.2 x 10-2

answer is C.

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