Saved Bookmarks
| 1. |
A horizontal jet of water coming out of a pipe of area of cross-section `20cm^(2)` hits a vertical wall with a velocity of `10ms^(-1)` and rebounds with the same speed. The force exerted by water on the wall is .A. the thrust exerted by the water on the wall will be doubledB. the thrust exerted by the water on the wall will be four timesC. the energy lost per second by water strikeup the wall will also be four timesD. the energy lost per second by water striking the wall be increased eight times. |
|
Answer» Correct Answer - B::D Thrust = Rate of charge of linear momentum Thrust = mv where m is mass striking per sec. `=rho avxxvimplies " " "Thrust" = rhoav^(2)` Energy lost for second `=(1)/(2)mv^(2)" "=(1)/(2)rho av.v^(2)=(1)/(2)rhoav^(3)` so option (B,D) are correct. |
|