Saved Bookmarks
| 1. |
If pressure at half the depth of a lake is equal to 2//3 pressure at the bottom of the lake then what is the depth of the lake ?A. 10 mB. 20 mC. 60 mD. 30 m |
|
Answer» Correct Answer - B (b) Pressure at bottom of the lake ` = P_0 + h rho g` and pressure at half the depth of a lake ` = P_0 + (h)/(2) rho g` According to given condition `P_0 + (1)/(2) h rho g = (2)/(3) (P_0 + h rho g) rArr (1)/(3) P_0 = (1)/(6)h rho g` `rArr h = (2P_0)/(rhog) = (2xx 10^5)/(10^3 xx 10) = 20 m.` |
|