Question

A ring of radius 4 cm is dipped into glycerine. (T = 63 dyne/cm) and pulled out of the liquid keeping it horizontal at the surface of liquid. The force required to detach the ring from the surface over and above its weight is ............ dyne.
(A) 6 π
(B) 504 π
(C) 1008 π
(D) 1512 π

Answer 1

Answer:

If is required to pull it away from water, the surface tension of ... 70.80 dyne cm⁻¹(c) 63.35 dyne cm⁻¹(d) 60 dyne cm ⁻¹ ... T\pi (8.5 cm +8.7 cm) = 3.97\ gram ...