Question

One cubic plate, having a 15 cm side, floats on water surface. If surface tension of water is 60 dyne/cm. To lift this plate from water, Find the extra force required against weight.

विकल्प

• 3600 dyne

• 1800 dyne

• 900 dyne

• 7200 dyne

Answer 1

3600 dyne

Explanation:

F = T × ℓ

= 60 dyne/cm × 15 cm × 4

= 3600 dyne