First slide

Surface tension

Question

Find the maximum weight of needle which can float on water having surface tension 0.073 N/m if length of needle is 4 cm.

Moderate

A

0.58 kg
B

0.584 kg
C

1.3 g
D

1.3 kg

Solution

$2 TL = mg \Rightarrow m = \frac{2 TL}{g} = 0.584 g$

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