InterviewSolution
Saved Bookmarks
InterviewSolution
| 1. |
A rectangular film of liquid is extended from `(4cmxx2cm)` to `(5cmxx4cm)`. If the work done is `3xx10^-4J`, the value of the surface tension of the liquid isA. 0.250 `Nm^(-1)`B. 0.125 `Nm^(-1)`C. 0.2 `Nm^(-1)`D. 8.0 `Nm^(-1)` |
|
Answer» Correct Answer - B `W=2(T DeltaA)` `DeltaA=A_(2)-A_(1)` `=(20-8)xx10^(-4)m^(2)` `=12xx10^(-4)m^(2)` `T=(W)/(2DeltaA)=(3xx10^(-4))/(2xx12xx10^(-4))` `T=(1)/(8)Nm=0.125N//m` |
|