Saved Bookmarks
| 1. |
A projectile is fired from earth vertically with a velocity Kv_(e ) where v_(e )= escape velocity and K is a constantless than unity. What is the maximum height to which it rises as measured from centre of earth? |
|
Answer» `(R )/(K^(2))` `(1)/(2)mk^(2)v_(e )^(2)=(GMm)/(R )-(GMm)/(r )` `(1)/(2) mk^(2)(2GM)/(R )=GMm[(1)/(R )-(1)/(r )]` `(1)/(r )=(1)/(R )-(k^(2))/(R )=(1-k^(2))/(R )` or`r=(R )/(1-k^(2))`. Correct choice is (b). |
|